If you're using mods, try disabling them:
Third-party mods or dedicated server tools (like Teknogods) can sometimes conflict with the standard file system check. Primary Solutions Correct the "Start In" Path: call of duty world at war filesyscheck.cfg error
Open your Steam Library and right-click on Call of Duty: World at War . Select > Installed Files (or Local Files). If you're using mods, try disabling them: Third-party
Right-click the CoDWaW.exe (or CoDWaWmp.exe for multiplayer). If you're using mods
Go to → Virus & threat protection → Manage ransomware protection → Turn Controlled folder access Off or add CoDWaW.exe to allowed apps.