Is it me or VISTA?

1. I play a lot of online games. I delete them when I'm finished with them.

2. When I run defrag I see a file listed for c:/program data. This file has the names of all the games that I have deleted in it! I try to go to c:/program data and it isn't there. I search for it and it doesn't show up. I search for the game titles and they don't show up.

3. Where is this file? Why is it not showing up? How do I get to it? I want to clean these remaining bits of games from my computer.

Thanks as always, Happy Holidays!