diff --git a/app.js b/app.js
index c95b39b..e8c9c01 100644
--- a/app.js
+++ b/app.js
@@ -188,7 +188,7 @@ if (typeof CreateObject === "undefined") {
 }
 
 if (typeof UseObject === "undefined") {
-    var UseObject = function(progId, callback, dispose) {
+    var UseObject = function(progId, callback, dispose, fallback) {
         if (typeof callback !== "function") {
             return null;
         }
@@ -204,6 +204,9 @@ if (typeof UseObject === "undefined") {
         var obj = CreateObject(progId);
         try {
             return callback(obj);
+        } catch (e) {
+            return (typeof fallback === "function" ?
+                fallback(obj, e) : null);
         } finally {
             dispose(obj);
             obj = null;