Master File Table

Hello
I am using Vista Home Basic 32bit. I was using my TuneUp Utilities to see what would come up when I use the undelete feature and could not believe all the stuff that came up.
I used to run MS FSX on this computer before I got one with a lot more heft to it for that sim. Uninstalled the FSX program and got rid of (I thought) any left over FSX stuff. Keep in mind that FSX was on this system for a few years before removal. Needless to say, other programs got the boot as well along with photoshop stuff etc etc.
Anyway, as the TuneUp undelete was going, it was looking in files called mft.
I've looked within program files and windows directory and can not find them.

What is the purpose of mft and can stuff that I once thought was deleted be deleted?:confused

Thanks for reading this

Regards
Ernest