Update logs, add check for valid RID

src/SourceBuild/content/eng/build.targets

@@ -8,6 +8,9 @@
           DependsOnTargets="DetermineSourceBuiltSdkVersion"
           Condition="'$(ShortStack)' != 'true'" >
 
+      <Message Text="Comparing built SDK against closest official build"
+               Importance="High"/>
+
       <GetValidArchiveItems ArchiveItems="@(SdkTarballItem)"
                             ArchiveName="dotnet-sdk">
         <Output TaskParameter="ValidArchiveItems"

src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff/Archive.cs

@@ -122,6 +122,15 @@ public abstract class Archive : IDisposable
             .Replace(Version, "")
             .Replace(packageName, "")
             .Trim('-', '.', '_');
+
+        // A RID with '.' must have a version number after the first '.' in each part of the RID. For example, alpine.3.10-arm64.
+        // Otherwise, it's likely an archive of another type of file that we don't handle here, for example, .msi.wixpack.zip.
+        var ridParts = Rid.Split('-');
+        foreach(var item in ridParts.SelectMany(p => p.Split('.').Skip(1)))
+        {
+            if (!int.TryParse(item, out _))
+                throw new ArgumentException($"Invalid Rid '{Rid}' in archive file name '{filename}'. Expected RID with '.' to be part of a version. This likely means the file is an archive of a different file type.");
+        }
         return (Version, Rid, extension);
     }
 }

src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff/GetValidArchiveItems.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using Microsoft.Build.Framework;
 
 public class GetValidArchiveItems : Microsoft.Build.Utilities.Task
@@ -21,15 +22,16 @@ public class GetValidArchiveItems : Microsoft.Build.Utilities.Task
         List<ITaskItem> archiveItems = new();
         foreach (var item in ArchiveItems)
         {
+            var filename = Path.GetFileName(item.ItemSpec);
             try
             {
                 // Ensure the version and RID info can be parsed from the item
-                _ = Archive.GetInfoFromFileName(item.ItemSpec, ArchiveName);
+                _ = Archive.GetInfoFromFileName(filename, ArchiveName);
                 archiveItems.Add(item);
             }
             catch (ArgumentException e)
             {
-                Log.LogMessage(MessageImportance.High, e.Message);
+                Log.LogMessage($"'{item.ItemSpec}' is not a valid archive name: '{e.Message}'");
                 continue;
             }
         }