Change file extension in Windows XP Rated 5 out of 5 stars

Here's how you can set XP to allow you to change the file extension:

http://www.mediacollege.com/microsoft/windows/xp/extension-change.html

Setting up Windows 7 and Vista to allow for file extension changes is done in a similar fashion.

http://www.programmerfish.com/how-to-change-file-extension-in-windows-7/

This review is for a previous version of the add-on (5.5.2).  This user has a previous review of this add-on.