A "top download" or modded version of the game may have missing configuration files in the package Steam Requirements:
The error in Call of Duty: Modern Warfare 2 filesyscheck cfg modern warfare 2 top download
If the file is physically missing, you may need to manually download a replacement filesyscheck.cfg from a trusted source and place it in your main game directory. Troubleshooting Common Launch Crashes A "top download" or modded version of the
The filesyscheck.cfg error in Call of Duty: Modern Warfare 2 filesyscheck cfg modern warfare 2 top download