Add file type in the pad attributes for existing files

www/file/inner.js

@@ -94,6 +94,8 @@ define([
                 Title.updateTitle(title || Title.defaultTitle);
                 toolbar.addElement(['pageTitle'], {pageTitle: title});
 
+                common.setPadAttribute('fileType', metadata.type);
+
                 var displayFile = function (ev, sizeMb, CB) {
                     var called_back;
                     var cb = function (e) {