If you are using a modded client (like the fan-favorite IW4x), the file structure is slightly different, and a standard Steam file might not work.
Interestingly, for some versions of the game, simply having a file with the correct name is enough to bypass the check. filesyscheck cfg modern warfare 2 top download
Rename it exactly to filesyscheck.cfg (ensure you delete the .txt extension). Try launching the game. Pro-Tip: Running MW2 on Windows 10/11 If you are using a modded client (like
Set the game to run in Compatibility Mode for Windows 7 . the file structure is slightly different
Sometimes Steam’s "Verify Integrity of Game Files" fails to replace this specific config.
C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 2\main