What files and what OS? How did you change them all?
Tried;
System Restore, (if Windows)?
Re-associating the files?
Mark
I accidentally changed most of my files to VLC's... So when I click on them, they open up in a video box and don't work. The file icons have the orange cone file picture... even like skype, tweetdeck, ie, etc. How can I revert them back to their original file?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic