--- nautilus-gksu/libnautilus-gksu.c 
+++ nautilus-gksu/libnautilus-gksu.fixed.c 
@@ -209,7 +209,7 @@
       GAppInfo *app_info = g_app_info_get_default_for_type (mime_type, strncmp (uri, "file://", 7));
       if (app_info)
 	{
-	  cmd = g_strdup (g_app_info_get_executable (app_info));
+	  cmd = g_strdup (g_app_info_get_commandline (app_info));
           g_object_unref (app_info);
 	}
     }