I just re-downloaded it to make sure we were talking about the same file. It's the same, and it does work on my XP sp2. Are you running it from the folder (directory) you want to change? One way to make sure is to move IESHWIZ.exe to the folder you want to change (or run it from a command prompt in that directory, or follow the instructions on the link). Also, you have to close and re-open the folder to see the change.