From c10bb6f318878379e68e7a97814cdca3ab096928 Mon Sep 17 00:00:00 2001
From: Abe Jellinek <jellinek@berkeley.edu>
Date: Thu, 24 Jul 2025 12:07:27 -0400
Subject: [PATCH] If custom file handler is set to Zotero itself, use reader
 (#5407)

---
 .../zotero/preferences/preferences_general.js    | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/chrome/content/zotero/preferences/preferences_general.js b/chrome/content/zotero/preferences/preferences_general.js
index 029aa91f94..a9f7795540 100644
--- a/chrome/content/zotero/preferences/preferences_general.js
+++ b/chrome/content/zotero/preferences/preferences_general.js
@@ -274,6 +274,22 @@ Zotero_Preferences.General = {
 	
 	setFileHandler: function (type, handler) {
 		var pref = this._getFileHandlerPref(type);
+		
+		var isZotero = false;
+		if (Zotero.isMac) {
+			isZotero = /Zotero.*\.app/.test(handler);
+		}
+		else if (Zotero.isWindows) {
+			isZotero = handler.endsWith('\\zotero.exe');
+		}
+		else if (Zotero.isLinux) {
+			isZotero = handler.endsWith('/zotero');
+		}
+		// Reset to the internal reader if pointing to Zotero
+		if (isZotero) {
+			handler = '';
+		}
+		
 		Zotero.Prefs.set(pref, handler);
 		this._updateFileHandlerUI();
 	},