can not open file Help ! ! ! !

i recently had to do a system restor on my pc and since then i can not open game files ect it say that i need to use the net to find wat program created it when i search i can never find out because there is so many different file types wat can i do to fix this problem i have tried to undo the system restore but this wont work ?????????????????? wat do i do next ??????????

What type of files are you trying to open?

There are manual settings via start > Control Panel > Folder Options > File Types

If you mean that you cannot start the game than the .exe has been corrupted. There is a restore key here:

http://dougknox.com/

Win XP Fixes

Easy File Associations for Windows XP