Here is another app script for WinBuilder.

Bulk Rename Utility v2.7.1.1 is a Free File Rename Utility for Windows. Rename multiple files with the click of a button. Batch renaming made easy.

The script has been tested in Win7RescuePE using WinBuilder 077 RC2 and 078 and should work in any other project.

Download: Bulk Rename Utility v2.7.1.1