--- a/mobile/android/components/FilePicker.js
+++ b/mobile/android/components/FilePicker.js
@@ -152,17 +152,18 @@ FilePicker.prototype = {
 
     return new File(f);
   },
 
   get domfiles() {
     let win = this._domWin;
     return this.getEnumerator([this.file], function(file) {
       if (win) {
-        return new win.File(file);
+        let utils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+        return utils.wrapDOMFile(file);
       }
 
       return new File(file);
     });
   },
 
   get addToRecentDocs() {
     return this._addToRecentDocs;