diff --git a/atom.gyp b/atom.gyp
index fe8af55045d0..b98b5e2b64f5 100644
--- a/atom.gyp
+++ b/atom.gyp
@@ -39,6 +39,7 @@
       'atom/common/api/lib/screen.coffee',
       'atom/common/api/lib/shell.coffee',
       'atom/common/lib/init.coffee',
+      'atom/common/lib/asar.coffee',
       'atom/renderer/lib/chrome-api.coffee',
       'atom/renderer/lib/init.coffee',
       'atom/renderer/lib/inspector.coffee',
@@ -121,6 +122,10 @@
       'atom/browser/native_window_observer.h',
       'atom/browser/net/adapter_request_job.cc',
       'atom/browser/net/adapter_request_job.h',
+      'atom/browser/net/asar/asar_protocol_handler.cc',
+      'atom/browser/net/asar/asar_protocol_handler.h',
+      'atom/browser/net/asar/url_request_asar_job.cc',
+      'atom/browser/net/asar/url_request_asar_job.h',
       'atom/browser/net/atom_url_request_job_factory.cc',
       'atom/browser/net/atom_url_request_job_factory.h',
       'atom/browser/net/url_request_string_job.cc',
@@ -174,6 +179,7 @@
       'atom/browser/window_list.h',
       'atom/browser/window_list_observer.h',
       'atom/common/api/api_messages.h',
+      'atom/common/api/atom_api_asar.cc',
       'atom/common/api/atom_api_clipboard.cc',
       'atom/common/api/atom_api_crash_reporter.cc',
       'atom/common/api/atom_api_id_weak_map.cc',
@@ -186,6 +192,10 @@
       'atom/common/api/atom_bindings.h',
       'atom/common/api/object_life_monitor.cc',
       'atom/common/api/object_life_monitor.h',
+      'atom/common/asar/archive.cc',
+      'atom/common/asar/archive.h',
+      'atom/common/asar/scoped_temporary_file.cc',
+      'atom/common/asar/scoped_temporary_file.h',
       'atom/common/common_message_generator.cc',
       'atom/common/common_message_generator.h',
       'atom/common/crash_reporter/crash_reporter.cc',
diff --git a/atom/browser/api/atom_api_app.cc b/atom/browser/api/atom_api_app.cc
index 858e6ef197e8..7331b66a8087 100644
--- a/atom/browser/api/atom_api_app.cc
+++ b/atom/browser/api/atom_api_app.cc
@@ -91,6 +91,10 @@ void App::OnWindowAllClosed() {
   Emit("window-all-closed");
 }
 
+void App::OnQuit() {
+  Emit("quit");
+}
+
 void App::OnOpenFile(bool* prevent_default, const std::string& file_path) {
   base::ListValue args;
   args.AppendString(file_path);
diff --git a/atom/browser/api/atom_api_app.h b/atom/browser/api/atom_api_app.h
index 0fcbf2c0a907..2afa563558f4 100644
--- a/atom/browser/api/atom_api_app.h
+++ b/atom/browser/api/atom_api_app.h
@@ -36,6 +36,7 @@ class App : public mate::EventEmitter,
   // BrowserObserver implementations:
   virtual void OnWillQuit(bool* prevent_default) OVERRIDE;
   virtual void OnWindowAllClosed() OVERRIDE;
+  virtual void OnQuit() OVERRIDE;
   virtual void OnOpenFile(bool* prevent_default,
                           const std::string& file_path) OVERRIDE;
   virtual void OnOpenURL(const std::string& url) OVERRIDE;
diff --git a/atom/browser/atom_browser_context.cc b/atom/browser/atom_browser_context.cc
index d3b40fe1ef99..4c4ac3d384c9 100644
--- a/atom/browser/atom_browser_context.cc
+++ b/atom/browser/atom_browser_context.cc
@@ -6,6 +6,7 @@
 
 #include "atom/browser/atom_browser_main_parts.h"
 #include "atom/browser/net/atom_url_request_job_factory.h"
+#include "atom/browser/net/asar/asar_protocol_handler.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/worker_pool.h"
 #include "chrome/browser/browser_process.h"
@@ -20,6 +21,12 @@ using content::BrowserThread;
 
 namespace atom {
 
+namespace {
+
+const char* kAsarScheme = "asar";
+
+}  // namespace
+
 AtomBrowserContext::AtomBrowserContext()
     : fake_browser_process_(new BrowserProcess),
       job_factory_(new AtomURLRequestJobFactory) {
@@ -44,6 +51,10 @@ net::URLRequestJobFactory* AtomBrowserContext::CreateURLRequestJobFactory(
       url::kFileScheme, new net::FileProtocolHandler(
           BrowserThread::GetBlockingPool()->GetTaskRunnerWithShutdownBehavior(
               base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
+  job_factory->SetProtocolHandler(
+      kAsarScheme, new asar::AsarProtocolHandler(
+          BrowserThread::GetBlockingPool()->GetTaskRunnerWithShutdownBehavior(
+              base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 
   // Set up interceptors in the reverse order.
   scoped_ptr<net::URLRequestJobFactory> top_job_factory =
diff --git a/atom/browser/browser.cc b/atom/browser/browser.cc
index afea053c66e2..9f31177d31ae 100644
--- a/atom/browser/browser.cc
+++ b/atom/browser/browser.cc
@@ -37,6 +37,8 @@ void Browser::Quit() {
 }
 
 void Browser::Shutdown() {
+  FOR_EACH_OBSERVER(BrowserObserver, observers_, OnQuit());
+
   is_quiting_ = true;
   base::MessageLoop::current()->Quit();
 }
diff --git a/atom/browser/browser_observer.h b/atom/browser/browser_observer.h
index 0f340b007947..df0243abe583 100644
--- a/atom/browser/browser_observer.h
+++ b/atom/browser/browser_observer.h
@@ -18,6 +18,9 @@ class BrowserObserver {
   // method will not be called, instead it will call OnWillQuit.
   virtual void OnWindowAllClosed() {}
 
+  // The browser is quitting.
+  virtual void OnQuit() {}
+
   // The browser has opened a file by double clicking in Finder or dragging the
   // file to the Dock icon. (OS X only)
   virtual void OnOpenFile(bool* prevent_default,
diff --git a/atom/browser/lib/init.coffee b/atom/browser/lib/init.coffee
index d25179c1ba49..ddfa56169611 100644
--- a/atom/browser/lib/init.coffee
+++ b/atom/browser/lib/init.coffee
@@ -52,20 +52,25 @@ setImmediate ->
       detail: message
       buttons: ['OK']
 
+  # Emit 'exit' event on quit.
+  require('app').on 'quit', ->
+    process.emit 'exit'
+
   # Load the RPC server.
   require './rpc-server.js'
 
   # Now we try to load app's package.json.
   packageJson = null
 
-  packagePath = path.join process.resourcesPath, 'app'
-  try
-    # First we try to load process.resourcesPath/app
-    packageJson = JSON.parse(fs.readFileSync(path.join(packagePath, 'package.json')))
-  catch error
-    # If not found then we load browser/default_app
-    packagePath = path.join process.resourcesPath, 'default_app'
-    packageJson = JSON.parse(fs.readFileSync(path.join(packagePath, 'package.json')))
+  searchPaths = [ 'app', 'app.asar', 'default_app' ]
+  for packagePath in searchPaths
+    try
+      packagePath = path.join process.resourcesPath, packagePath
+      packageJson = JSON.parse(fs.readFileSync(path.join(packagePath, 'package.json')))
+    catch e
+      continue
+
+  throw new Error("Unable to find a valid app") unless packageJson?
 
   # Set application's version.
   app = require 'app'
@@ -80,7 +85,7 @@ setImmediate ->
   # Set application's desktop name.
   if packageJson.desktopName?
     app.setDesktopName packageJson.desktopName
-  else 
+  else
     app.setDesktopName '#{app.getName()}.desktop'
 
   # Load the chrome extension support.
diff --git a/atom/browser/net/asar/asar_protocol_handler.cc b/atom/browser/net/asar/asar_protocol_handler.cc
new file mode 100644
index 000000000000..04f0aa94dd3f
--- /dev/null
+++ b/atom/browser/net/asar/asar_protocol_handler.cc
@@ -0,0 +1,91 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/net/asar/asar_protocol_handler.h"
+
+#include "atom/browser/net/asar/url_request_asar_job.h"
+#include "atom/common/asar/archive.h"
+#include "net/base/filename_util.h"
+#include "net/base/net_errors.h"
+#include "net/url_request/url_request_error_job.h"
+#include "net/url_request/url_request_file_job.h"
+
+namespace asar {
+
+namespace {
+
+const base::FilePath::CharType kAsarExtension[] = FILE_PATH_LITERAL(".asar");
+
+// Get the relative path in asar archive.
+bool GetAsarPath(const base::FilePath& full_path,
+                 base::FilePath* asar_path,
+                 base::FilePath* relative_path) {
+  base::FilePath iter = full_path;
+  while (true) {
+    base::FilePath dirname = iter.DirName();
+    if (iter.MatchesExtension(kAsarExtension))
+      break;
+    else if (iter == dirname)
+      return false;
+    iter = dirname;
+  }
+
+  base::FilePath tail;
+  if (!iter.AppendRelativePath(full_path, &tail))
+    return false;
+
+  *asar_path = iter;
+  *relative_path = tail;
+  return true;
+}
+
+}  // namespace
+
+AsarProtocolHandler::AsarProtocolHandler(
+    const scoped_refptr<base::TaskRunner>& file_task_runner)
+    : file_task_runner_(file_task_runner) {}
+
+AsarProtocolHandler::~AsarProtocolHandler() {
+}
+
+Archive* AsarProtocolHandler::GetOrCreateAsarArchive(
+    const base::FilePath& path) const {
+  if (!archives_.contains(path)) {
+    scoped_ptr<Archive> archive(new Archive(path));
+    if (!archive->Init())
+      return nullptr;
+
+    archives_.set(path, archive.Pass());
+  }
+
+  return archives_.get(path);
+}
+
+net::URLRequestJob* AsarProtocolHandler::MaybeCreateJob(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate) const {
+  base::FilePath full_path;
+  net::FileURLToFilePath(request->url(), &full_path);
+
+  // Create asar:// job when the path contains "xxx.asar/", otherwise treat the
+  // URL request as file://.
+  base::FilePath asar_path, relative_path;
+  if (!GetAsarPath(full_path, &asar_path, &relative_path))
+    return new net::URLRequestFileJob(request, network_delegate, full_path,
+                                      file_task_runner_);
+
+  Archive* archive = GetOrCreateAsarArchive(asar_path);
+  if (!archive)
+    return new net::URLRequestErrorJob(request, network_delegate,
+                                       net::ERR_FILE_NOT_FOUND);
+
+  return new URLRequestAsarJob(request, network_delegate, archive,
+                               relative_path, file_task_runner_);
+}
+
+bool AsarProtocolHandler::IsSafeRedirectTarget(const GURL& location) const {
+  return false;
+}
+
+}  // namespace asar
diff --git a/atom/browser/net/asar/asar_protocol_handler.h b/atom/browser/net/asar/asar_protocol_handler.h
new file mode 100644
index 000000000000..e88ee9b8691b
--- /dev/null
+++ b/atom/browser/net/asar/asar_protocol_handler.h
@@ -0,0 +1,45 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_NET_ASAR_ASAR_PROTOCOL_HANDLER_H_
+#define ATOM_BROWSER_NET_ASAR_ASAR_PROTOCOL_HANDLER_H_
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "net/url_request/url_request_job_factory.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace asar {
+
+class Archive;
+
+class AsarProtocolHandler : public net::URLRequestJobFactory::ProtocolHandler {
+ public:
+  explicit AsarProtocolHandler(
+      const scoped_refptr<base::TaskRunner>& file_task_runner);
+  virtual ~AsarProtocolHandler();
+
+  Archive* GetOrCreateAsarArchive(const base::FilePath& path) const;
+
+  // net::URLRequestJobFactory::ProtocolHandler:
+  virtual net::URLRequestJob* MaybeCreateJob(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const OVERRIDE;
+  virtual bool IsSafeRedirectTarget(const GURL& location) const OVERRIDE;
+
+ private:
+  const scoped_refptr<base::TaskRunner> file_task_runner_;
+
+  mutable base::ScopedPtrHashMap<base::FilePath, Archive> archives_;
+
+  DISALLOW_COPY_AND_ASSIGN(AsarProtocolHandler);
+};
+
+}  // namespace asar
+
+#endif  // ATOM_BROWSER_NET_ASAR_ASAR_PROTOCOL_HANDLER_H_
diff --git a/atom/browser/net/asar/url_request_asar_job.cc b/atom/browser/net/asar/url_request_asar_job.cc
new file mode 100644
index 000000000000..a66eaf57d717
--- /dev/null
+++ b/atom/browser/net/asar/url_request_asar_job.cc
@@ -0,0 +1,142 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/net/asar/url_request_asar_job.h"
+
+#include <string>
+
+#include "net/base/file_stream.h"
+#include "net/base/io_buffer.h"
+#include "net/base/mime_util.h"
+#include "net/base/net_errors.h"
+#include "net/url_request/url_request_status.h"
+
+namespace asar {
+
+URLRequestAsarJob::URLRequestAsarJob(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate,
+    Archive* archive,
+    const base::FilePath& file_path,
+    const scoped_refptr<base::TaskRunner>& file_task_runner)
+    : net::URLRequestJob(request, network_delegate),
+      archive_(archive),
+      file_path_(file_path),
+      stream_(new net::FileStream(file_task_runner)),
+      remaining_bytes_(0),
+      file_task_runner_(file_task_runner),
+      weak_ptr_factory_(this) {}
+
+URLRequestAsarJob::~URLRequestAsarJob() {}
+
+void URLRequestAsarJob::Start() {
+  if (!archive_ || !archive_->GetFileInfo(file_path_, &file_info_)) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
+                                     net::ERR_FILE_NOT_FOUND));
+    return;
+  }
+
+  remaining_bytes_ = static_cast<int64>(file_info_.size);
+
+  int flags = base::File::FLAG_OPEN |
+              base::File::FLAG_READ |
+              base::File::FLAG_ASYNC;
+  int rv = stream_->Open(archive_->path(), flags,
+                         base::Bind(&URLRequestAsarJob::DidOpen,
+                                    weak_ptr_factory_.GetWeakPtr()));
+  if (rv != net::ERR_IO_PENDING)
+    DidOpen(rv);
+}
+
+void URLRequestAsarJob::Kill() {
+  weak_ptr_factory_.InvalidateWeakPtrs();
+  URLRequestJob::Kill();
+}
+
+bool URLRequestAsarJob::ReadRawData(net::IOBuffer* dest,
+                                    int dest_size,
+                                    int* bytes_read) {
+  if (remaining_bytes_ < dest_size)
+    dest_size = static_cast<int>(remaining_bytes_);
+
+  // If we should copy zero bytes because |remaining_bytes_| is zero, short
+  // circuit here.
+  if (!dest_size) {
+    *bytes_read = 0;
+    return true;
+  }
+
+  int rv = stream_->Read(dest,
+                         dest_size,
+                         base::Bind(&URLRequestAsarJob::DidRead,
+                                    weak_ptr_factory_.GetWeakPtr(),
+                                    make_scoped_refptr(dest)));
+  if (rv >= 0) {
+    // Data is immediately available.
+    *bytes_read = rv;
+    remaining_bytes_ -= rv;
+    DCHECK_GE(remaining_bytes_, 0);
+    return true;
+  }
+
+  // Otherwise, a read error occured.  We may just need to wait...
+  if (rv == net::ERR_IO_PENDING) {
+    SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
+  } else {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, rv));
+  }
+  return false;
+}
+
+bool URLRequestAsarJob::GetMimeType(std::string* mime_type) const {
+  return net::GetMimeTypeFromFile(file_path_, mime_type);
+}
+
+void URLRequestAsarJob::DidOpen(int result) {
+  if (result != net::OK) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, result));
+    return;
+  }
+
+  int rv = stream_->Seek(net::FROM_BEGIN,
+                         file_info_.offset,
+                         base::Bind(&URLRequestAsarJob::DidSeek,
+                                    weak_ptr_factory_.GetWeakPtr()));
+  if (rv != net::ERR_IO_PENDING) {
+    // stream_->Seek() failed, so pass an intentionally erroneous value
+    // into DidSeek().
+    DidSeek(-1);
+  }
+}
+
+void URLRequestAsarJob::DidSeek(int64 result) {
+  if (result != static_cast<int64>(file_info_.offset)) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
+                                     net::ERR_REQUEST_RANGE_NOT_SATISFIABLE));
+    return;
+  }
+
+  set_expected_content_size(remaining_bytes_);
+  NotifyHeadersComplete();
+}
+
+void URLRequestAsarJob::DidRead(scoped_refptr<net::IOBuffer> buf, int result) {
+  if (result > 0) {
+    SetStatus(net::URLRequestStatus());  // Clear the IO_PENDING status
+    remaining_bytes_ -= result;
+    DCHECK_GE(remaining_bytes_, 0);
+  }
+
+  buf = NULL;
+
+  if (result == 0) {
+    NotifyDone(net::URLRequestStatus());
+  } else if (result < 0) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, result));
+  }
+
+  NotifyReadComplete(result);
+}
+
+}  // namespace asar
diff --git a/atom/browser/net/asar/url_request_asar_job.h b/atom/browser/net/asar/url_request_asar_job.h
new file mode 100644
index 000000000000..f228d4312c74
--- /dev/null
+++ b/atom/browser/net/asar/url_request_asar_job.h
@@ -0,0 +1,72 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_NET_ASAR_URL_REQUEST_ASAR_JOB_H_
+#define ATOM_BROWSER_NET_ASAR_URL_REQUEST_ASAR_JOB_H_
+
+#include <string>
+
+#include "atom/common/asar/archive.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "net/url_request/url_request_job.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace net {
+class FileStream;
+}
+
+namespace asar {
+
+class URLRequestAsarJob : public net::URLRequestJob {
+ public:
+  URLRequestAsarJob(net::URLRequest* request,
+                    net::NetworkDelegate* network_delegate,
+                    Archive* archive,
+                    const base::FilePath& file_path,
+                    const scoped_refptr<base::TaskRunner>& file_task_runner);
+
+  // net::URLRequestJob:
+  virtual void Start() OVERRIDE;
+  virtual void Kill() OVERRIDE;
+  virtual bool ReadRawData(net::IOBuffer* buf,
+                           int buf_size,
+                           int* bytes_read) OVERRIDE;
+  virtual bool GetMimeType(std::string* mime_type) const OVERRIDE;
+
+ protected:
+  virtual ~URLRequestAsarJob();
+
+ private:
+  // Callback after opening file on a background thread.
+  void DidOpen(int result);
+
+  // Callback after seeking to the beginning of |byte_range_| in the file
+  // on a background thread.
+  void DidSeek(int64 result);
+
+  // Callback after data is asynchronously read from the file into |buf|.
+  void DidRead(scoped_refptr<net::IOBuffer> buf, int result);
+
+  Archive* archive_;
+  Archive::FileInfo file_info_;
+  base::FilePath file_path_;
+
+  scoped_ptr<net::FileStream> stream_;
+  int64 remaining_bytes_;
+
+  const scoped_refptr<base::TaskRunner> file_task_runner_;
+
+  base::WeakPtrFactory<URLRequestAsarJob> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLRequestAsarJob);
+};
+
+}  // namespace asar
+
+#endif  // ATOM_BROWSER_NET_ASAR_URL_REQUEST_ASAR_JOB_H_
diff --git a/atom/common/api/atom_api_asar.cc b/atom/common/api/atom_api_asar.cc
new file mode 100644
index 000000000000..5cc2616ac0b3
--- /dev/null
+++ b/atom/common/api/atom_api_asar.cc
@@ -0,0 +1,117 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include <vector>
+
+#include "atom/common/asar/archive.h"
+#include "atom/common/native_mate_converters/file_path_converter.h"
+#include "native_mate/arguments.h"
+#include "native_mate/dictionary.h"
+#include "native_mate/object_template_builder.h"
+#include "native_mate/wrappable.h"
+
+#include "atom/common/node_includes.h"
+
+namespace {
+
+class Archive : public mate::Wrappable {
+ public:
+  static v8::Handle<v8::Value> Create(v8::Isolate* isolate,
+                                      const base::FilePath& path) {
+    scoped_ptr<asar::Archive> archive(new asar::Archive(path));
+    if (!archive->Init())
+      return v8::False(isolate);
+    return (new Archive(archive.Pass()))->GetWrapper(isolate);
+  }
+
+ protected:
+  explicit Archive(scoped_ptr<asar::Archive> archive)
+      : archive_(archive.Pass()) {}
+
+  // Reads the offset and size of file.
+  v8::Handle<v8::Value> GetFileInfo(v8::Isolate* isolate,
+                                    const base::FilePath& path) {
+    asar::Archive::FileInfo info;
+    if (!archive_ || !archive_->GetFileInfo(path, &info))
+      return v8::False(isolate);
+    mate::Dictionary dict(isolate, v8::Object::New(isolate));
+    dict.Set("size", info.size);
+    dict.Set("offset", info.offset);
+    return dict.GetHandle();
+  }
+
+  // Returns a fake result of fs.stat(path).
+  v8::Handle<v8::Value> Stat(v8::Isolate* isolate,
+                             const base::FilePath& path) {
+    asar::Archive::Stats stats;
+    if (!archive_ || !archive_->Stat(path, &stats))
+      return v8::False(isolate);
+    mate::Dictionary dict(isolate, v8::Object::New(isolate));
+    dict.Set("size", stats.size);
+    dict.Set("offset", stats.offset);
+    dict.Set("isFile", stats.is_file);
+    dict.Set("isDirectory", stats.is_directory);
+    dict.Set("isLink", stats.is_link);
+    return dict.GetHandle();
+  }
+
+  // Returns all files under a directory.
+  v8::Handle<v8::Value> Readdir(v8::Isolate* isolate,
+                                const base::FilePath& path) {
+    std::vector<base::FilePath> files;
+    if (!archive_ || !archive_->Readdir(path, &files))
+      return v8::False(isolate);
+    return mate::ConvertToV8(isolate, files);
+  }
+
+  // Returns the path of file with symbol link resolved.
+  v8::Handle<v8::Value> Realpath(v8::Isolate* isolate,
+                                 const base::FilePath& path) {
+    base::FilePath realpath;
+    if (!archive_ || !archive_->Realpath(path, &realpath))
+      return v8::False(isolate);
+    return mate::ConvertToV8(isolate, realpath);
+  }
+
+  // Copy the file out into a temporary file and returns the new path.
+  v8::Handle<v8::Value> CopyFileOut(v8::Isolate* isolate,
+                                    const base::FilePath& path) {
+    base::FilePath new_path;
+    if (!archive_ || !archive_->CopyFileOut(path, &new_path))
+      return v8::False(isolate);
+    return mate::ConvertToV8(isolate, new_path);
+  }
+
+  // Free the resources used by archive.
+  void Destroy() {
+    archive_.reset();
+  }
+
+  // mate::Wrappable:
+  mate::ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate) {
+    return mate::ObjectTemplateBuilder(isolate)
+        .SetValue("path", archive_->path())
+        .SetMethod("getFileInfo", &Archive::GetFileInfo)
+        .SetMethod("stat", &Archive::Stat)
+        .SetMethod("readdir", &Archive::Readdir)
+        .SetMethod("realpath", &Archive::Realpath)
+        .SetMethod("copyFileOut", &Archive::CopyFileOut)
+        .SetMethod("destroy", &Archive::Destroy);
+  }
+
+ private:
+  scoped_ptr<asar::Archive> archive_;
+
+  DISALLOW_COPY_AND_ASSIGN(Archive);
+};
+
+void Initialize(v8::Handle<v8::Object> exports, v8::Handle<v8::Value> unused,
+                v8::Handle<v8::Context> context, void* priv) {
+  mate::Dictionary dict(context->GetIsolate(), exports);
+  dict.SetMethod("createArchive", &Archive::Create);
+}
+
+}  // namespace
+
+NODE_MODULE_CONTEXT_AWARE_BUILTIN(atom_common_asar, Initialize)
diff --git a/atom/common/asar/archive.cc b/atom/common/asar/archive.cc
new file mode 100644
index 000000000000..5ff97f267bb6
--- /dev/null
+++ b/atom/common/asar/archive.cc
@@ -0,0 +1,252 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/asar/archive.h"
+
+#include <string>
+#include <vector>
+
+#include "atom/common/asar/scoped_temporary_file.h"
+#include "base/files/file.h"
+#include "base/logging.h"
+#include "base/pickle.h"
+#include "base/json/json_string_value_serializer.h"
+#include "base/strings/string_number_conversions.h"
+
+namespace asar {
+
+namespace {
+
+#if defined(OS_WIN)
+const char kSeparators[] = "\\/";
+#else
+const char kSeparators[] = "/";
+#endif
+
+bool GetNodeFromPath(std::string path,
+                     const base::DictionaryValue* root,
+                     const base::DictionaryValue** out);
+
+// Gets the "files" from "dir".
+bool GetFilesNode(const base::DictionaryValue* root,
+                  const base::DictionaryValue* dir,
+                  const base::DictionaryValue** out) {
+  // Test for symbol linked directory.
+  std::string link;
+  if (dir->GetStringWithoutPathExpansion("link", &link)) {
+    const base::DictionaryValue* linked_node = NULL;
+    if (!GetNodeFromPath(link, root, &linked_node))
+      return false;
+    dir = linked_node;
+  }
+
+  return dir->GetDictionaryWithoutPathExpansion("files", out);
+}
+
+// Gets sub-file "name" from "dir".
+bool GetChildNode(const base::DictionaryValue* root,
+                  const std::string& name,
+                  const base::DictionaryValue* dir,
+                  const base::DictionaryValue** out) {
+  const base::DictionaryValue* files = NULL;
+  return GetFilesNode(root, dir, &files) &&
+         files->GetDictionaryWithoutPathExpansion(name, out);
+}
+
+// Gets the node of "path" from "root".
+bool GetNodeFromPath(std::string path,
+                     const base::DictionaryValue* root,
+                     const base::DictionaryValue** out) {
+  if (path == "") {
+    *out = root;
+    return true;
+  }
+
+  const base::DictionaryValue* dir = root;
+  for (size_t delimiter_position = path.find_first_of(kSeparators);
+       delimiter_position != std::string::npos;
+       delimiter_position = path.find_first_of(kSeparators)) {
+    const base::DictionaryValue* child = NULL;
+    if (!GetChildNode(root, path.substr(0, delimiter_position), dir, &child))
+      return false;
+
+    dir = child;
+    path.erase(0, delimiter_position + 1);
+  }
+
+  return GetChildNode(root, path, dir, out);
+}
+
+bool FillFileInfoWithNode(Archive::FileInfo* info,
+                          uint32 header_size,
+                          const base::DictionaryValue* node) {
+  std::string offset;
+  if (!node->GetString("offset", &offset))
+    return false;
+  if (!base::StringToUint64(offset, &info->offset))
+    return false;
+
+  int size;
+  if (!node->GetInteger("size", &size))
+    return false;
+
+  info->offset += header_size;
+  info->size = static_cast<uint32>(size);
+  return true;
+}
+
+}  // namespace
+
+Archive::Archive(const base::FilePath& path)
+    : path_(path),
+      header_size_(0) {
+}
+
+Archive::~Archive() {
+}
+
+bool Archive::Init() {
+  base::File file(path_, base::File::FLAG_OPEN | base::File::FLAG_READ);
+  if (!file.IsValid())
+    return false;
+
+  std::vector<char> buf;
+  int len;
+
+  buf.resize(8);
+  len = file.ReadAtCurrentPos(buf.data(), buf.size());
+  if (len != static_cast<int>(buf.size())) {
+    PLOG(ERROR) << "Failed to read header size from " << path_.value();
+    return false;
+  }
+
+  uint32 size;
+  if (!PickleIterator(Pickle(buf.data(), buf.size())).ReadUInt32(&size)) {
+    LOG(ERROR) << "Failed to parse header size from " << path_.value();
+    return false;
+  }
+
+  buf.resize(size);
+  len = file.ReadAtCurrentPos(buf.data(), buf.size());
+  if (len != static_cast<int>(buf.size())) {
+    PLOG(ERROR) << "Failed to read header from " << path_.value();
+    return false;
+  }
+
+  std::string header;
+  if (!PickleIterator(Pickle(buf.data(), buf.size())).ReadString(&header)) {
+    LOG(ERROR) << "Failed to parse header from " << path_.value();
+    return false;
+  }
+
+  std::string error;
+  JSONStringValueSerializer serializer(&header);
+  base::Value* value = serializer.Deserialize(NULL, &error);
+  if (!value || !value->IsType(base::Value::TYPE_DICTIONARY)) {
+    LOG(ERROR) << "Failed to parse header: " << error;
+    return false;
+  }
+
+  header_size_ = 8 + size;
+  header_.reset(static_cast<base::DictionaryValue*>(value));
+  return true;
+}
+
+bool Archive::GetFileInfo(const base::FilePath& path, FileInfo* info) {
+  if (!header_)
+    return false;
+
+  const base::DictionaryValue* node;
+  if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
+    return false;
+
+  std::string link;
+  if (node->GetString("link", &link))
+    return GetFileInfo(base::FilePath::FromUTF8Unsafe(link), info);
+
+  return FillFileInfoWithNode(info, header_size_, node);
+}
+
+bool Archive::Stat(const base::FilePath& path, Stats* stats) {
+  if (!header_)
+    return false;
+
+  const base::DictionaryValue* node;
+  if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
+    return false;
+
+  if (node->HasKey("link")) {
+    stats->is_file = false;
+    stats->is_link = true;
+    return true;
+  }
+
+  if (node->HasKey("files")) {
+    stats->is_file = false;
+    stats->is_directory = true;
+    return true;
+  }
+
+  return FillFileInfoWithNode(stats, header_size_, node);
+}
+
+bool Archive::Readdir(const base::FilePath& path,
+                      std::vector<base::FilePath>* list) {
+  if (!header_)
+    return false;
+
+  const base::DictionaryValue* node;
+  if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
+    return false;
+
+  const base::DictionaryValue* files;
+  if (!GetFilesNode(header_.get(), node, &files))
+    return false;
+
+  base::DictionaryValue::Iterator iter(*files);
+  while (!iter.IsAtEnd()) {
+    list->push_back(base::FilePath::FromUTF8Unsafe(iter.key()));
+    iter.Advance();
+  }
+  return true;
+}
+
+bool Archive::Realpath(const base::FilePath& path, base::FilePath* realpath) {
+  if (!header_)
+    return false;
+
+  const base::DictionaryValue* node;
+  if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
+    return false;
+
+  std::string link;
+  if (node->GetString("link", &link)) {
+    *realpath = base::FilePath::FromUTF8Unsafe(link);
+    return true;
+  }
+
+  *realpath = path;
+  return true;
+}
+
+bool Archive::CopyFileOut(const base::FilePath& path, base::FilePath* out) {
+  if (external_files_.contains(path)) {
+    *out = external_files_.get(path)->path();
+    return true;
+  }
+
+  FileInfo info;
+  if (!GetFileInfo(path, &info))
+    return false;
+
+  scoped_ptr<ScopedTemporaryFile> temp_file(new ScopedTemporaryFile);
+  if (!temp_file->InitFromFile(path_, info.offset, info.size))
+    return false;
+
+  *out = temp_file->path();
+  external_files_.set(path, temp_file.Pass());
+  return true;
+}
+
+}  // namespace asar
diff --git a/atom/common/asar/archive.h b/atom/common/asar/archive.h
new file mode 100644
index 000000000000..0058f0269d8a
--- /dev/null
+++ b/atom/common/asar/archive.h
@@ -0,0 +1,76 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_COMMON_ASAR_ARCHIVE_H_
+#define ATOM_COMMON_ASAR_ARCHIVE_H_
+
+#include <vector>
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace asar {
+
+class ScopedTemporaryFile;
+
+// This class represents an asar package, and provides methods to read
+// information from it.
+class Archive {
+ public:
+  struct FileInfo {
+    FileInfo() : size(0), offset(0) {}
+    uint32 size;
+    uint64 offset;
+  };
+
+  struct Stats : public FileInfo {
+    Stats() : is_file(true), is_directory(false), is_link(false) {}
+    bool is_file;
+    bool is_directory;
+    bool is_link;
+  };
+
+  explicit Archive(const base::FilePath& path);
+  virtual ~Archive();
+
+  // Read and parse the header.
+  bool Init();
+
+  // Get the info of a file.
+  bool GetFileInfo(const base::FilePath& path, FileInfo* info);
+
+  // Fs.stat(path).
+  bool Stat(const base::FilePath& path, Stats* stats);
+
+  // Fs.readdir(path).
+  bool Readdir(const base::FilePath& path, std::vector<base::FilePath>* files);
+
+  // Fs.realpath(path).
+  bool Realpath(const base::FilePath& path, base::FilePath* realpath);
+
+  // Copy the file into a temporary file, and return the new path.
+  bool CopyFileOut(const base::FilePath& path, base::FilePath* out);
+
+  base::FilePath path() const { return path_; }
+  base::DictionaryValue* header() const { return header_.get(); }
+
+ private:
+  base::FilePath path_;
+  uint32 header_size_;
+  scoped_ptr<base::DictionaryValue> header_;
+
+  // Cached external temporary files.
+  base::ScopedPtrHashMap<base::FilePath, ScopedTemporaryFile> external_files_;
+
+  DISALLOW_COPY_AND_ASSIGN(Archive);
+};
+
+}  // namespace asar
+
+#endif  // ATOM_COMMON_ASAR_ARCHIVE_H_
diff --git a/atom/common/asar/scoped_temporary_file.cc b/atom/common/asar/scoped_temporary_file.cc
new file mode 100644
index 000000000000..799f09d88d21
--- /dev/null
+++ b/atom/common/asar/scoped_temporary_file.cc
@@ -0,0 +1,54 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/asar/scoped_temporary_file.h"
+
+#include <vector>
+
+#include "base/file_util.h"
+#include "base/threading/thread_restrictions.h"
+
+namespace asar {
+
+ScopedTemporaryFile::ScopedTemporaryFile() {
+}
+
+ScopedTemporaryFile::~ScopedTemporaryFile() {
+  if (!path_.empty()) {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    base::DeleteFile(path_, false);
+  }
+}
+
+bool ScopedTemporaryFile::Init() {
+  if (!path_.empty())
+    return true;
+
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+  return base::CreateTemporaryFile(&path_);
+}
+
+bool ScopedTemporaryFile::InitFromFile(const base::FilePath& path,
+                                       uint64 offset, uint64 size) {
+  if (!Init())
+    return false;
+
+  base::File src(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
+  if (!src.IsValid())
+    return false;
+
+  std::vector<char> buf(size);
+  int len = src.Read(offset, buf.data(), buf.size());
+  if (len != static_cast<int>(size))
+    return false;
+
+  base::File dest(path_, base::File::FLAG_OPEN | base::File::FLAG_WRITE);
+  if (!dest.IsValid())
+    return false;
+
+  return dest.WriteAtCurrentPos(buf.data(), buf.size()) ==
+      static_cast<int>(size);
+}
+
+}  // namespace asar
diff --git a/atom/common/asar/scoped_temporary_file.h b/atom/common/asar/scoped_temporary_file.h
new file mode 100644
index 000000000000..69e76a05c56e
--- /dev/null
+++ b/atom/common/asar/scoped_temporary_file.h
@@ -0,0 +1,37 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_COMMON_ASAR_SCOPED_TEMPORARY_FILE_H_
+#define ATOM_COMMON_ASAR_SCOPED_TEMPORARY_FILE_H_
+
+#include "base/files/file_path.h"
+
+namespace asar {
+
+// An object representing a temporary file that should be cleaned up when this
+// object goes out of scope.  Note that since deletion occurs during the
+// destructor, no further error handling is possible if the directory fails to
+// be deleted.  As a result, deletion is not guaranteed by this class.
+class ScopedTemporaryFile {
+ public:
+  ScopedTemporaryFile();
+  virtual ~ScopedTemporaryFile();
+
+  // Init an empty temporary file.
+  bool Init();
+
+  // Init an temporary file and fill it with content of |path|.
+  bool InitFromFile(const base::FilePath& path, uint64 offset, uint64 size);
+
+  base::FilePath path() const { return path_; }
+
+ private:
+  base::FilePath path_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTemporaryFile);
+};
+
+}  // namespace asar
+
+#endif  // ATOM_COMMON_ASAR_SCOPED_TEMPORARY_FILE_H_
diff --git a/atom/common/lib/asar.coffee b/atom/common/lib/asar.coffee
new file mode 100644
index 000000000000..8d92563fc67b
--- /dev/null
+++ b/atom/common/lib/asar.coffee
@@ -0,0 +1,296 @@
+asar = process.atomBinding 'asar'
+child_process = require 'child_process'
+fs = require 'fs'
+path = require 'path'
+util = require 'util'
+
+# Cache asar archive objects.
+cachedArchives = {}
+getOrCreateArchive = (p) ->
+  archive = cachedArchives[p]
+  return archive if archive?
+  archive = asar.createArchive p
+  return false unless archive
+  cachedArchives[p] = archive
+
+# Clean cache on quit.
+process.on 'exit', ->
+  archive.destroy() for p, archive of cachedArchives
+
+# Separate asar package's path from full path.
+splitPath = (p) ->
+  return [false] if typeof p isnt 'string'
+  return [true, p, ''] if p.substr(-5) is '.asar'
+  index = p.lastIndexOf ".asar#{path.sep}"
+  return [false] if index is -1
+  [true, p.substr(0, index + 5), p.substr(index + 6)]
+
+# Convert asar archive's Stats object to fs's Stats object.
+nextInode = 0
+uid = if process.getuid? then process.getuid() else 0
+gid = if process.getgid? then process.getgid() else 0
+asarStatsToFsStats = (stats) ->
+  {
+    dev: 1,
+    ino: ++nextInode,
+    mode: 33188,
+    nlink: 1,
+    uid: uid,
+    gid: gid,
+    rdev: 0,
+    size: stats.size
+    isFile: -> stats.isFile
+    isDirectory: -> stats.isDirectory
+    isSymbolicLink: -> stats.isLink
+    isBlockDevice: -> false
+    isCharacterDevice: -> false
+    isFIFO: -> false
+    isSocket: -> false
+  }
+
+# Create a ENOENT error.
+createNotFoundError = (asarPath, filePath) ->
+  error = new Error("ENOENT, #{filePath} not found in #{asarPath}")
+  error.code = "ENOENT"
+  error.errno = -2
+  error
+
+# Override fs APIs.
+lstatSync = fs.lstatSync
+fs.lstatSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return lstatSync p unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  throw new Error("Invalid package #{asarPath}") unless archive
+
+  stats = archive.stat filePath
+  throw createNotFoundError(asarPath, filePath) unless stats
+
+  asarStatsToFsStats stats
+
+lstat = fs.lstat
+fs.lstat = (p, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return lstat p, callback unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  return callback new Error("Invalid package #{asarPath}") unless archive
+
+  stats = getOrCreateArchive(asarPath).stat filePath
+  return callback createNotFoundError(asarPath, filePath) unless stats
+
+  process.nextTick -> callback null, asarStatsToFsStats stats
+
+statSync = fs.statSync
+fs.statSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return statSync p unless isAsar
+
+  # Do not distinguish links for now.
+  fs.lstatSync p
+
+stat = fs.stat
+fs.stat = (p, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return stat p, callback unless isAsar
+
+  # Do not distinguish links for now.
+  process.nextTick -> fs.lstat p, callback
+
+statSyncNoException = fs.statSyncNoException
+fs.statSyncNoException = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return statSyncNoException p unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  return false unless archive
+  stats = archive.stat filePath
+  return false unless stats
+  asarStatsToFsStats stats
+
+realpathSync = fs.realpathSync
+fs.realpathSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return realpathSync.apply this, arguments unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  throw new Error("Invalid package #{asarPath}") unless archive
+
+  real = archive.realpath filePath
+  throw createNotFoundError(asarPath, filePath) if real is false
+
+  path.join realpathSync(asarPath), real
+
+realpath = fs.realpath
+fs.realpath = (p, cache, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return realpath.apply this, arguments unless isAsar
+
+  if typeof cache is 'function'
+    callback = cache
+    cache = undefined
+
+  archive = getOrCreateArchive asarPath
+  return callback new Error("Invalid package #{asarPath}") unless archive
+
+  real = archive.realpath filePath
+  return callback createNotFoundError(asarPath, filePath) if real is false
+
+  realpath asarPath, (err, p) ->
+    return callback err if err
+    callback null, path.join(p, real)
+
+exists = fs.exists
+fs.exists = (p, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return exists p, callback unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  return callback new Error("Invalid package #{asarPath}") unless archive
+
+  process.nextTick -> callback archive.stat(filePath) isnt false
+
+existsSync = fs.existsSync
+fs.existsSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return existsSync p unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  return false unless archive
+
+  archive.stat(filePath) isnt false
+
+open = fs.open
+readFile = fs.readFile
+fs.readFile = (p, options, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readFile.apply this, arguments unless isAsar
+
+  if typeof options is 'function'
+    callback = options
+    options = undefined
+
+  archive = getOrCreateArchive asarPath
+  return callback new Error("Invalid package #{asarPath}") unless archive
+
+  info = archive.getFileInfo filePath
+  return callback createNotFoundError(asarPath, filePath) unless info
+
+  if not options
+    options = encoding: null, flag: 'r'
+  else if util.isString options
+    options = encoding: options, flag: 'r'
+  else if not util.isObject options
+    throw new TypeError('Bad arguments')
+
+  flag = options.flag || 'r'
+  encoding = options.encoding
+
+  buffer = new Buffer(info.size)
+  open archive.path, flag, (error, fd) ->
+    return callback error if error
+    fs.read fd, buffer, 0, info.size, info.offset, (error) ->
+      fs.close fd, ->
+        callback error, if encoding then buffer.toString encoding else buffer
+
+openSync = fs.openSync
+readFileSync = fs.readFileSync
+fs.readFileSync = (p, options) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readFileSync.apply this, arguments unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  throw new Error("Invalid package #{asarPath}") unless archive
+
+  info = archive.getFileInfo filePath
+  throw createNotFoundError(asarPath, filePath) unless info
+
+  if not options
+    options = encoding: null, flag: 'r'
+  else if util.isString options
+    options = encoding: options, flag: 'r'
+  else if not util.isObject options
+    throw new TypeError('Bad arguments')
+
+  flag = options.flag || 'r'
+  encoding = options.encoding
+
+  buffer = new Buffer(info.size)
+  fd = openSync archive.path, flag
+  try
+    fs.readSync fd, buffer, 0, info.size, info.offset
+  catch e
+    throw e
+  finally
+    fs.closeSync fd
+  if encoding then buffer.toString encoding else buffer
+
+readdir = fs.readdir
+fs.readdir = (p, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readdir.apply this, arguments unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  return callback new Error("Invalid package #{asarPath}") unless archive
+
+  files = archive.readdir filePath
+  return callback createNotFoundError(asarPath, filePath) unless files
+
+  process.nextTick -> callback null, files
+
+readdirSync = fs.readdirSync
+fs.readdirSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readdirSync.apply this, arguments unless isAsar
+
+  archive = getOrCreateArchive asarPath
+  throw new Error("Invalid package #{asarPath}") unless archive
+
+  files = archive.readdir filePath
+  throw createNotFoundError(asarPath, filePath) unless files
+
+  files
+
+# Override APIs that rely on passing file path instead of content to C++.
+overrideAPISync = (module, name, arg = 0) ->
+  old = module[name]
+  module[name] = ->
+    p = arguments[arg]
+    [isAsar, asarPath, filePath] = splitPath p
+    return old.apply this, arguments unless isAsar
+
+    archive = getOrCreateArchive asarPath
+    throw new Error("Invalid package #{asarPath}") unless archive
+
+    newPath = archive.copyFileOut filePath
+    throw createNotFoundError(asarPath, filePath) unless newPath
+
+    arguments[arg] = newPath
+    old.apply this, arguments
+
+overrideAPI = (module, name, arg = 0) ->
+  old = module[name]
+  module[name] = ->
+    p = arguments[arg]
+    [isAsar, asarPath, filePath] = splitPath p
+    return old.apply this, arguments unless isAsar
+
+    callback = arguments[arguments.length - 1]
+    return overrideAPISync module, name, arg unless typeof callback is 'function'
+
+    archive = getOrCreateArchive asarPath
+    return callback new Error("Invalid package #{asarPath}") unless archive
+
+    newPath = archive.copyFileOut filePath
+    return callback  createNotFoundError(asarPath, filePath) unless newPath
+
+    arguments[arg] = newPath
+    old.apply this, arguments
+
+overrideAPI fs, 'open'
+overrideAPI child_process, 'execFile'
+overrideAPISync process, 'dlopen', 1
+overrideAPISync require('module')._extensions, '.node', 1
+overrideAPISync fs, 'openSync'
+overrideAPISync child_process, 'fork'
diff --git a/atom/common/lib/init.coffee b/atom/common/lib/init.coffee
index 0b4b2c224aca..c85fb65a958a 100644
--- a/atom/common/lib/init.coffee
+++ b/atom/common/lib/init.coffee
@@ -33,3 +33,6 @@ global.clearImmediate = timers.clearImmediate
 if process.type is 'browser'
   global.setTimeout = wrapWithActivateUvLoop timers.setTimeout
   global.setInterval = wrapWithActivateUvLoop timers.setInterval
+
+# Add support for asar packages.
+require './asar'
diff --git a/atom/common/node_bindings.cc b/atom/common/node_bindings.cc
index a4dec37f3bd5..a6f3659a2276 100644
--- a/atom/common/node_bindings.cc
+++ b/atom/common/node_bindings.cc
@@ -69,6 +69,7 @@ REFERENCE_MODULE(atom_browser_protocol);
 REFERENCE_MODULE(atom_browser_global_shortcut);
 REFERENCE_MODULE(atom_browser_tray);
 REFERENCE_MODULE(atom_browser_window);
+REFERENCE_MODULE(atom_common_asar);
 REFERENCE_MODULE(atom_common_clipboard);
 REFERENCE_MODULE(atom_common_crash_reporter);
 REFERENCE_MODULE(atom_common_id_weak_map);
diff --git a/atom/renderer/lib/init.coffee b/atom/renderer/lib/init.coffee
index 94d8679ca019..3fb4ceaabf42 100644
--- a/atom/renderer/lib/init.coffee
+++ b/atom/renderer/lib/init.coffee
@@ -24,8 +24,12 @@ require path.resolve(__dirname, '..', '..', 'common', 'lib', 'init.js')
 global.require = require
 global.module = module
 
-# Set the __filename to the path of html file if it's file:// protocol.
-if window.location.protocol is 'file:'
+# Emit the 'exit' event when page is unloading.
+window.addEventListener 'unload', ->
+  process.emit 'exit'
+
+# Set the __filename to the path of html file if it's file: or asar: protocol.
+if window.location.protocol in ['file:', 'asar:']
   pathname =
     if process.platform is 'win32'
       window.location.pathname.substr 1
diff --git a/docs/README.md b/docs/README.md
index db94d57a381a..d5d3468f760d 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -2,6 +2,7 @@
 
 * [Quick start](tutorial/quick-start.md)
 * [Application distribution](tutorial/application-distribution.md)
+* [Application packaging](tutorial/application-packaging.md)
 * [Using native node modules](tutorial/using-native-node-modules.md)
 * [Debugging browser process](tutorial/debugging-browser-process.md)
 * [Using Selenium and WebDriver](tutorial/using-selenium-and-webdriver.md)
diff --git a/docs/api/app.md b/docs/api/app.md
index 0f585f5e521f..b9a837d77bb2 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -45,6 +45,10 @@ terminating the application.
 See description of `window-all-closed` for the differences between `will-quit`
 and it.
 
+## Event: quit
+
+Emitted when application is quitting.
+
 ## Event: open-file
 
 * `event` Event
diff --git a/docs/tutorial/application-distribution.md b/docs/tutorial/application-distribution.md
index cba702c42268..72d78bc9b253 100644
--- a/docs/tutorial/application-distribution.md
+++ b/docs/tutorial/application-distribution.md
@@ -27,7 +27,19 @@ Then execute `Atom.app` (or `atom` on Linux, and `atom.exe` on Windows), and
 atom-shell will start as your app. The `atom-shell` directory would then be
 your distribution that should be delivered to final users.
 
-## Build with grunt
+## Packaging your app into a file
+
+Apart from shipping your app by copying all its sources files, you can also
+package your app into [asar](https://github.com/atom/asar) archive to avoid
+exposing your app's source code to users.
+
+To use the `asar` archive to replace the `app` folder, you need to rename the
+archive to `app.asar`, and put it under atom-shell's resources directory,
+atom-shell will then try read the archive and start from it. 
+
+More details can be found in [Application packaging](application-packaging.md).
+
+## Building with grunt
 
 If you build your application with `grunt` there is a grunt task that can
 download atom-shell for your current platform automatically:
diff --git a/docs/tutorial/application-packaging.md b/docs/tutorial/application-packaging.md
new file mode 100644
index 000000000000..0303969d6767
--- /dev/null
+++ b/docs/tutorial/application-packaging.md
@@ -0,0 +1,139 @@
+# Application packaging
+
+To protect your app's resources and source code from the users, you can choose
+to package your app into [asar][asar] archive with little changes to your source
+code.
+
+## Generating `asar` archive
+
+The [asar][asar] archive is a simple tar-like format that concatenates files
+into a single file, atom-shell can read arbitrary file in it without unpacking
+the whole file.
+
+Following is the steps to package your app into `asar` archive:
+
+### 1. Install asar utility
+
+```bash
+$ npm install -g asar
+```
+
+### 2. Package with `asar pack`
+
+```bash
+$ asar pack your-app app.asar
+```
+
+## Using `asar` archives
+
+In atom-shell there are two sets of APIs: Node APIs provided by Node.js, and Web
+APIs provided by Chromium. Both APIs support reading file from `asar` archives.
+
+### Node API
+
+With special patches in atom-shell, Node APIs like `fs.readFile` and `require`
+treat `asar` archives as virtual directories, and the files in it as normal
+files in filesystem.
+
+For example, suppose we have an `example.asar` archive under `/path/to`:
+
+```bash
+$ asar list /path/to/example.asar
+/app.js
+/file.txt
+/dir/module.js
+/static/index.html
+/static/main.css
+/static/jquery.min.js
+```
+
+Read a file in `asar` archive:
+
+```javascript
+var fs = require('fs');
+fs.readFileSync('/path/to/example.asar/file.txt');
+```
+
+List all files under the root of archive:
+
+```javascript
+var fs = require('fs');
+fs.readdirSync('/path/to/example.asar');
+```
+
+Use a module from the archive:
+
+```javascript
+require('/path/to/example.asar/dir/module.js');
+```
+
+### Web API
+
+In web page files in archive can be requests by using the `asar:` protocol,
+like node API, `asar` archives are treated as directories.
+
+For example, to get a file with `$.get`:
+
+```html
+<script>
+var $ = require('./jquery.min.js');
+$.get('asar:/path/to/example.asar/file.txt', function(data) {
+  console.log(data);
+});
+</script>
+```
+
+The `asar:` protocol can also be used to request normal files in filesystem,
+just like the `file:` protocol. But unlike `file:` protocol, there is no slashes
+(`//`) after `asar:`.
+
+You can also display a web page in `asar` archive with `BrowserWindow`:
+
+```javascript
+var BrowserWindow = require('browser-window');
+var win = new BrowserWindow({width: 800, height: 600});
+win.loadUrl('asar:/path/to/example.asar/static/index.html');
+```
+
+## Limitations on Node API
+
+Even though we tried hard to make `asar` archives in Node API work like
+directories as much as possible, there are still limitations due to the
+low-level nature of Node API.
+
+### Archives are read only
+
+The archives can not be modifies so all Node APIs that can modify files will not
+work with `asar` archives.
+
+### Working directory can not be set to directories in archive
+
+Though `asar` archives are treated as directories, there are no actual
+directories in the filesystem, so you can never set working directory to
+directories in `asar` archives, passing them to `cwd` option of some APIs will
+also cause errors.
+
+### Extra unpacking on some APIs
+
+Most `fs` APIs can read file or get file's information from `asar` archives
+without unpacking, but for some APIs that rely on passing the real file path to
+underlying system calls, atom-shell will extract the needed file into a
+temporary file and pass the path of the temporary file to the APIs to make them
+work. This adds a little overhead for those APIs.
+
+APIs that requires extra unpacking are:
+
+* `child_process.execFile`
+* `child_process.fork`
+* `fs.open`
+* `fs.openSync`
+* `process.dlopen` - Used by `require` on native modules
+
+### Fake stat information of `fs.stat`
+
+The `Stats` object returned by `fs.stat` and its friends on files in `asar`
+archives are generated by guessing, because those files do not exist on
+filesystem. So you should not trust the `Stats` object except for getting file
+size and checking file type.
+
+[asar]: https://github.com/atom/asar
diff --git a/docs/tutorial/quick-start.md b/docs/tutorial/quick-start.md
index 84e41f08cd78..dca58f679654 100644
--- a/docs/tutorial/quick-start.md
+++ b/docs/tutorial/quick-start.md
@@ -8,8 +8,8 @@ a variant of the Node.js runtime which is focused on desktop applications
 instead of web servers.
 
 It doesn't mean atom-shell is a JavaScript binding to GUI libraries. Instead,
-atom-shell uses web pages as its GUI, so you could also see it as a minimal Chromium
-browser, controlled by JavaScript.
+atom-shell uses web pages as its GUI, so you could also see it as a minimal
+Chromium browser, controlled by JavaScript.
 
 ### The browser side
 
@@ -18,9 +18,11 @@ are two types of JavaScript scripts: the server side scripts and the client side
 scripts. Server-side JavaScript is that which runs on the Node.js
 runtime, while client-side JavaScript runs inside the user's browser.
 
-In atom-shell we have similar concepts: Since atom-shell displays a GUI by showing
-web pages, we have **scripts that run in the web page**, and also **scripts run by the atom-shell runtime**, which creates those web pages.
-Like Node.js, we call them **client scripts**, and **browser scripts** (meaning the browser replaces the concept of the server here).
+In atom-shell we have similar concepts: Since atom-shell displays a GUI by
+showing web pages, we have **scripts that run in the web page**, and also
+**scripts run by the atom-shell runtime**, which creates those web pages.
+Like Node.js, we call them **client scripts**, and **browser scripts**
+(meaning the browser replaces the concept of the server here).
 
 In traditional Node.js applications, communication between server and
 client is usually facilitated via web sockets. In atom-shell, we have provided
@@ -30,19 +32,20 @@ support.
 
 ### Web page and Node.js
 
-Normal web pages are designed to not reach outside of the browser, which makes them
-unsuitable for interacting with native systems. Atom-shell provides Node.js APIs
-in web pages so you can access native resources from web pages, just like
+Normal web pages are designed to not reach outside of the browser, which makes
+them unsuitable for interacting with native systems. Atom-shell provides Node.js
+APIs in web pages so you can access native resources from web pages, just like
 [Node-Webkit](https://github.com/rogerwang/node-webkit).
 
 But unlike Node-Webkit, you cannot do native GUI related operations in web
-pages. Instead you need to do them on the browser side by sending messages to it, or
-using the easy [remote](../api/remote.md) module.
+pages. Instead you need to do them on the browser side by sending messages to
+it, or using the easy [remote](../api/remote.md) module.
 
 
 ## Write your first atom-shell app
 
-Generally, an atom-shell app would be structured like this (see the   [hello-atom](https://github.com/dougnukem/hello-atom) repo for reference):
+Generally, an atom-shell app would be structured like this (see the
+[hello-atom](https://github.com/dougnukem/hello-atom) repo for reference):
 
 ```text
 your-app/
@@ -51,10 +54,10 @@ your-app/
 └── index.html
 ```
 
-The format of `package.json` is exactly the same as that of Node's modules, and the
-script specified by the `main` field is the startup script of your app, which
-will run on the browser side. An example of your `package.json` might look like
-this:
+The format of `package.json` is exactly the same as that of Node's modules, and
+the script specified by the `main` field is the startup script of your app,
+which will run on the browser side. An example of your `package.json` might look
+like this:
 
 ```json
 {
@@ -123,8 +126,8 @@ Finally the `index.html` is the web page you want to show:
 
 After you're done writing your app, you can create a distribution by
 following the [Application distribution](./application-distribution.md) guide
-and then execute the packaged app. 
-You can also just use the downloaded atom-shell binary to execute your app directly.
+and then execute the packaged app. You can also just use the downloaded
+atom-shell binary to execute your app directly.
 
 On Windows:
 
@@ -144,4 +147,5 @@ On Mac OS X:
 $ ./Atom.app/Contents/MacOS/Atom your-app/
 ```
 
-`Atom.app` here is part of the atom-shell's release package, you can download it from [here](https://github.com/atom/atom-shell/releases).
+`Atom.app` here is part of the atom-shell's release package, you can download
+it from [here](https://github.com/atom/atom-shell/releases).
diff --git a/spec/asar-spec.coffee b/spec/asar-spec.coffee
new file mode 100644
index 000000000000..d1d4c6d996f7
--- /dev/null
+++ b/spec/asar-spec.coffee
@@ -0,0 +1,375 @@
+assert = require 'assert'
+fs     = require 'fs'
+path   = require 'path'
+
+describe 'asar package', ->
+  fixtures = path.join __dirname, 'fixtures'
+
+  describe 'node api', ->
+    describe 'fs.readFileSync', ->
+      it 'reads a normal file', ->
+        file1 = path.join fixtures, 'asar', 'a.asar', 'file1'
+        assert.equal fs.readFileSync(file1).toString(), 'file1\n'
+        file2 = path.join fixtures, 'asar', 'a.asar', 'file2'
+        assert.equal fs.readFileSync(file2).toString(), 'file2\n'
+        file3 = path.join fixtures, 'asar', 'a.asar', 'file3'
+        assert.equal fs.readFileSync(file3).toString(), 'file3\n'
+
+      it 'reads a linked file', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link1'
+        assert.equal fs.readFileSync(p).toString(), 'file1\n'
+
+      it 'reads a file from linked directory', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'file1'
+        assert.equal fs.readFileSync(p).toString(), 'file1\n'
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link2', 'file1'
+        assert.equal fs.readFileSync(p).toString(), 'file1\n'
+
+      it 'throws ENOENT error when can not find file', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        throws = -> fs.readFileSync p
+        assert.throws throws, /ENOENT/
+
+    describe 'fs.readFile', ->
+      it 'reads a normal file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'file1'
+        fs.readFile p, (err, content) ->
+          assert.equal err, null
+          assert.equal String(content), 'file1\n'
+          done()
+
+      it 'reads a linked file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link1'
+        fs.readFile p, (err, content) ->
+          assert.equal err, null
+          assert.equal String(content), 'file1\n'
+          done()
+
+      it 'reads a file from linked directory', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link2', 'file1'
+        fs.readFile p, (err, content) ->
+          assert.equal err, null
+          assert.equal String(content), 'file1\n'
+          done()
+
+      it 'throws ENOENT error when can not find file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        fs.readFile p, (err, content) ->
+          assert.equal err.code, 'ENOENT'
+          done()
+
+    describe 'fs.lstatSync', ->
+      it 'returns information of root', ->
+        p = path.join fixtures, 'asar', 'a.asar'
+        stats = fs.lstatSync p
+        assert.equal stats.isFile(), false
+        assert.equal stats.isDirectory(), true
+        assert.equal stats.isSymbolicLink(), false
+        assert.equal stats.size, 0
+
+      it 'returns information of a normal file', ->
+        for file in ['file1', 'file2', 'file3', path.join('dir1', 'file1'), path.join('link2', 'file1')]
+          p = path.join fixtures, 'asar', 'a.asar', file
+          stats = fs.lstatSync p
+          assert.equal stats.isFile(), true
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), false
+          assert.equal stats.size, 6
+
+      it 'returns information of a normal directory', ->
+        for file in ['dir1', 'dir2', 'dir3']
+          p = path.join fixtures, 'asar', 'a.asar', file
+          stats = fs.lstatSync p
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), true
+          assert.equal stats.isSymbolicLink(), false
+          assert.equal stats.size, 0
+
+      it 'returns information of a linked file', ->
+        for file in ['link1', path.join('dir1', 'link1'), path.join('link2', 'link2')]
+          p = path.join fixtures, 'asar', 'a.asar', file
+          stats = fs.lstatSync p
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), true
+          assert.equal stats.size, 0
+
+      it 'returns information of a linked directory', ->
+        for file in ['link2', path.join('dir1', 'link2'), path.join('link2', 'link2')]
+          p = path.join fixtures, 'asar', 'a.asar', file
+          stats = fs.lstatSync p
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), true
+          assert.equal stats.size, 0
+
+      it 'throws ENOENT error when can not find file', ->
+        for file in ['file4', 'file5', path.join('dir1', 'file4')]
+          p = path.join fixtures, 'asar', 'a.asar', file
+          throws = -> fs.lstatSync p
+          assert.throws throws, /ENOENT/
+
+    describe 'fs.lstat', ->
+      it 'returns information of root', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err, null
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), true
+          assert.equal stats.isSymbolicLink(), false
+          assert.equal stats.size, 0
+          done()
+
+      it 'returns information of a normal file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'file1'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err, null
+          assert.equal stats.isFile(), true
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), false
+          assert.equal stats.size, 6
+          done()
+
+      it 'returns information of a normal directory', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'dir1'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err, null
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), true
+          assert.equal stats.isSymbolicLink(), false
+          assert.equal stats.size, 0
+          done()
+
+      it 'returns information of a linked file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link1'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err, null
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), true
+          assert.equal stats.size, 0
+          done()
+
+      it 'returns information of a linked directory', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link2'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err, null
+          assert.equal stats.isFile(), false
+          assert.equal stats.isDirectory(), false
+          assert.equal stats.isSymbolicLink(), true
+          assert.equal stats.size, 0
+          done()
+
+      it 'throws ENOENT error when can not find file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'file4'
+        stats = fs.lstat p, (err, stats) ->
+          assert.equal err.code, 'ENOENT'
+          done()
+
+    describe 'fs.realpathSync', ->
+      it 'returns real path root', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = 'a.asar'
+        r = fs.realpathSync path.join(parent, p)
+        assert.equal r, path.join(parent, p)
+
+      it 'returns real path of a normal file', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'file1'
+        r = fs.realpathSync path.join(parent, p)
+        assert.equal r, path.join(parent, p)
+
+      it 'returns real path of a normal directory', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'dir1'
+        r = fs.realpathSync path.join(parent, p)
+        assert.equal r, path.join(parent, p)
+
+      it 'returns real path of a linked file', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'link2', 'link1'
+        r = fs.realpathSync path.join(parent, p)
+        assert.equal r, path.join(parent, 'a.asar', 'file1')
+
+      it 'returns real path of a linked directory', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'link2', 'link2'
+        r = fs.realpathSync path.join(parent, p)
+        assert.equal r, path.join(parent, 'a.asar', 'dir1')
+
+      it 'throws ENOENT error when can not find file', ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'not-exist'
+        throws = -> fs.realpathSync path.join(parent, p)
+        assert.throws throws, /ENOENT/
+
+    describe 'fs.realpath', ->
+      it 'returns real path root', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = 'a.asar'
+        fs.realpath path.join(parent, p), (err, r) ->
+          assert.equal err, null
+          assert.equal r, path.join(parent, p)
+          done()
+
+      it 'returns real path of a normal file', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'file1'
+        fs.realpath path.join(parent, p), (err, r) ->
+          assert.equal err, null
+          assert.equal r, path.join(parent, p)
+          done()
+
+      it 'returns real path of a normal directory', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'dir1'
+        fs.realpath path.join(parent, p), (err, r) ->
+          assert.equal err, null
+          assert.equal r, path.join(parent, p)
+          done()
+
+      it 'returns real path of a linked file', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'link2', 'link1'
+        fs.realpath path.join(parent, p), (err, r) ->
+          assert.equal err, null
+          assert.equal r, path.join(parent, 'a.asar', 'file1')
+          done()
+
+      it 'returns real path of a linked directory', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'link2', 'link2'
+        fs.realpath path.join(parent, p), (err, r) ->
+          assert.equal err, null
+          assert.equal r, path.join(parent, 'a.asar', 'dir1')
+          done()
+
+      it 'throws ENOENT error when can not find file', (done) ->
+        parent = fs.realpathSync path.join(fixtures, 'asar')
+        p = path.join 'a.asar', 'not-exist'
+        fs.realpath path.join(parent, p), (err, stats) ->
+          assert.equal err.code, 'ENOENT'
+          done()
+
+    describe 'fs.readdirSync', ->
+      it 'reads dirs from root', ->
+        p = path.join fixtures, 'asar', 'a.asar'
+        dirs = fs.readdirSync p
+        assert.deepEqual dirs, ['dir1', 'dir2', 'dir3', 'file1', 'file2', 'file3', 'link1', 'link2', 'ping.js']
+
+      it 'reads dirs from a normal dir', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'dir1'
+        dirs = fs.readdirSync p
+        assert.deepEqual dirs, ['file1', 'file2', 'file3', 'link1', 'link2']
+
+      it 'reads dirs from a linked dir', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link2'
+        dirs = fs.readdirSync p
+        assert.deepEqual dirs, ['file1', 'file2', 'file3', 'link1', 'link2']
+
+      it 'throws ENOENT error when can not find file', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        throws = -> fs.readdirSync p
+        assert.throws throws, /ENOENT/
+
+    describe 'fs.readdir', ->
+      it 'reads dirs from root', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar'
+        dirs = fs.readdir p, (err, dirs) ->
+          assert.equal err, null
+          assert.deepEqual dirs, ['dir1', 'dir2', 'dir3', 'file1', 'file2', 'file3', 'link1', 'link2', 'ping.js']
+          done()
+
+      it 'reads dirs from a normal dir', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'dir1'
+        dirs = fs.readdir p, (err, dirs) ->
+          assert.equal err, null
+          assert.deepEqual dirs, ['file1', 'file2', 'file3', 'link1', 'link2']
+          done()
+
+      it 'reads dirs from a linked dir', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'link2', 'link2'
+        dirs = fs.readdir p, (err, dirs) ->
+          assert.equal err, null
+          assert.deepEqual dirs, ['file1', 'file2', 'file3', 'link1', 'link2']
+          done()
+
+      it 'throws ENOENT error when can not find file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        fs.readdir p, (err, stats) ->
+          assert.equal err.code, 'ENOENT'
+          done()
+
+    describe 'fs.openSync', ->
+      it 'opens a normal/linked/under-linked-directory file', ->
+        for file in ['file1', 'link1', path.join('link2', 'file1')]
+          p = path.join fixtures, 'asar', 'a.asar', file
+          fd = fs.openSync p, 'r'
+          buffer = new Buffer(6)
+          fs.readSync fd, buffer, 0, 6, 0
+          assert.equal String(buffer), 'file1\n'
+          fs.closeSync fd
+
+      it 'throws ENOENT error when can not find file', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        throws = -> fs.openSync p
+        assert.throws throws, /ENOENT/
+
+    describe 'fs.open', ->
+      it 'opens a normal file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'file1'
+        fs.open p, 'r', (err, fd) ->
+          assert.equal err, null
+          buffer = new Buffer(6)
+          fs.read fd, buffer, 0, 6, 0, (err) ->
+            assert.equal err, null
+            assert.equal String(buffer), 'file1\n'
+            fs.close fd, done
+
+      it 'throws ENOENT error when can not find file', (done) ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        fs.open p, (err, stats) ->
+          assert.equal err.code, 'ENOENT'
+          done()
+
+    describe 'child_process.fork', ->
+      child_process = require 'child_process'
+
+      it 'opens a normal js file', (done) ->
+        child = child_process.fork path.join(fixtures, 'asar', 'a.asar', 'ping.js')
+        child.on 'message', (msg) ->
+          assert.equal msg, 'message'
+          done()
+        child.send 'message'
+
+      it 'throws ENOENT error when can not find file', ->
+        p = path.join fixtures, 'asar', 'a.asar', 'not-exist'
+        throws = -> child_process.fork p
+        assert.throws throws, /ENOENT/
+
+  describe 'asar protocol', ->
+    it 'can request a file in package', (done) ->
+      p = path.resolve fixtures, 'asar', 'a.asar', 'file1'
+      $.get "asar:#{p}", (data) ->
+        assert.equal data, 'file1\n'
+        done()
+
+    it 'can request a linked file in package', (done) ->
+      p = path.resolve fixtures, 'asar', 'a.asar', 'link2', 'link1'
+      $.get "asar:#{p}", (data) ->
+        assert.equal data, 'file1\n'
+        done()
+
+    it 'can request a file in filesystem', (done) ->
+      p = path.resolve fixtures, 'asar', 'file'
+      $.get "asar:#{p}", (data) ->
+        assert.equal data, 'file\n'
+        done()
+
+    it 'gets 404 when file is not found', (done) ->
+      p = path.resolve fixtures, 'asar', 'a.asar', 'no-exist'
+      $.ajax
+        url: "asar:#{p}"
+        error: (err) ->
+          assert.equal err.status, 404
+          done()
diff --git a/spec/fixtures/asar/a.asar b/spec/fixtures/asar/a.asar
new file mode 100644
index 000000000000..0b74f5639cd8
Binary files /dev/null and b/spec/fixtures/asar/a.asar differ
diff --git a/spec/fixtures/asar/file b/spec/fixtures/asar/file
new file mode 100644
index 000000000000..f73f3093ff86
--- /dev/null
+++ b/spec/fixtures/asar/file
@@ -0,0 +1 @@
+file
diff --git a/vendor/native_mate b/vendor/native_mate
index 12f4e9b7ea00..c5b39126ee73 160000
--- a/vendor/native_mate
+++ b/vendor/native_mate
@@ -1 +1 @@
-Subproject commit 12f4e9b7ea0038e58e52839142eff0a4d17069bf
+Subproject commit c5b39126ee7388acc61a25ac6b5fefb7a2cd6262