diff --git a/calendar/base/content/preferences/alarms.js b/calendar/base/content/preferences/alarms.js
index cad0aecfc38..39815237db9 100644
--- a/calendar/base/content/preferences/alarms.js
+++ b/calendar/base/content/preferences/alarms.js
@@ -122,6 +122,7 @@ var gAlarmsPane = {
 
         var bundlePreferences = document.getElementById("bundlePreferences");
         var title = bundlePreferences.getString("Open");
+        fp.appendFilters(nsIFilePicker.filterAll);
         fp.init(window, title, nsIFilePicker.modeOpen);
 
         var ret = fp.show();