Why is steam validating my game files
This can be after you moved Steam to a new computer or a new hard drive (and the games with it), after you experienced a crash of the system, or after an update of a game on Steam that somehow changed it so that it does not start or work properly anymore.
While you could go ahead and remove games from Steam right away to install them anew, validation is often the better solution.
Create the file in the script's directory and add game numbers to it (one per line).
The easiest way to find the number is to right-click a game and select create desktop shortcut.
While the executable file may be more convenient to use, it is suggested to use the script instead as you can go through it to verify that it is legit before you run it.Validation works similar to Windows' sfc /scannow command.It will check the integrity of game files to make sure they are in working order.Once that is out of the way, it will load Steam and start validating all installed games on the PC. Some games on the other hand will load an installer instead when you run verification.