diff --git a/src/Gui/MainWindow.cpp b/src/Gui/MainWindow.cpp
index 40b9f3a811..70f5d207d5 100644
--- a/src/Gui/MainWindow.cpp
+++ b/src/Gui/MainWindow.cpp
@@ -1804,11 +1804,12 @@ void MainWindow::delayedStartup()
 #ifdef Q_OS_MAC
 void MainWindow::registerQuickLookExtensions()
 {
-    // Check if we've already registered extensions to avoid repeated registration
-    static bool quickLookRegistered = false;
-    if (quickLookRegistered) {
+    // Only check once per session
+    static bool quickLookChecked = false;
+    if (quickLookChecked) {
         return;
     }
+    quickLookChecked = true;
 
     // Get the path to FreeCAD.app/Contents/PlugIns
     QString appPath = QApplication::applicationDirPath();
@@ -1818,26 +1819,39 @@ void MainWindow::registerQuickLookExtensions()
     QString previewExt = plugInsPath + "/FreeCADPreviewExtension.appex";
 
     // Check if extensions exist before attempting registration
-    if (QFileInfo::exists(thumbnailExt) && QFileInfo::exists(previewExt)) {
-        // Register extensions with pluginkit
-        QProcess::execute("pluginkit", QStringList() << "-a" << thumbnailExt);
-        QProcess::execute("pluginkit", QStringList() << "-a" << previewExt);
-
-        // Activate extensions
-        QProcess::execute(
-            "pluginkit",
-            QStringList() << "-e" << "use" << "-i" << "org.freecad.FreeCAD.quicklook.thumbnail"
-        );
-        QProcess::execute(
-            "pluginkit",
-            QStringList() << "-e" << "use" << "-i" << "org.freecad.FreeCAD.quicklook.preview"
-        );
-
-        quickLookRegistered = true;
-
-        // Optional: Log successful registration (will appear in system notification)
-        Base::Console().log("QuickLook extensions registered successfully\n");
+    if (!QFileInfo::exists(thumbnailExt) || !QFileInfo::exists(previewExt)) {
+        return;
     }
+
+    // Check if extensions are already registered with pluginkit
+    QProcess checkProcess;
+    checkProcess.start("pluginkit", QStringList() << "-m");
+    checkProcess.waitForFinished();
+    QString registeredPlugins = QString::fromUtf8(checkProcess.readAllStandardOutput());
+
+    const QString thumbnailId = QStringLiteral("org.freecad.FreeCAD.quicklook.thumbnail");
+    const QString previewId = QStringLiteral("org.freecad.FreeCAD.quicklook.preview");
+
+    bool thumbnailRegistered = registeredPlugins.contains(thumbnailId);
+    bool previewRegistered = registeredPlugins.contains(previewId);
+
+    if (thumbnailRegistered && previewRegistered) {
+        Base::Console().log("QuickLook extensions already registered\n");
+        return;
+    }
+
+    // Register and activate only the extensions that are not yet registered
+    if (!thumbnailRegistered) {
+        QProcess::execute("pluginkit", QStringList() << "-a" << thumbnailExt);
+        QProcess::execute("pluginkit", QStringList() << "-e" << "use" << "-i" << thumbnailId);
+    }
+
+    if (!previewRegistered) {
+        QProcess::execute("pluginkit", QStringList() << "-a" << previewExt);
+        QProcess::execute("pluginkit", QStringList() << "-e" << "use" << "-i" << previewId);
+    }
+
+    Base::Console().log("QuickLook extensions registered successfully\n");
 }
 #endif