We will start with the easiest, least invasive fixes and escalate to nuclear options. Do not skip steps.
The most common cause of this error is a shortcut pointing to the wrong folder. Follow these steps to fix it:
This paper provides a comprehensive technical analysis of the "Filesyscheck.cfg" error encountered by users attempting to launch or modify Call of Duty: World at War (CoD: WaW). This error, often manifesting as a crash to the desktop (CTD) immediately upon startup, is distinct in that it acts as a checksum validation failure. This document explores the underlying causes, specifically focusing on file integrity corruption, version mismatches introduced by patches, and conflicts arising from third-party modifications. Furthermore, it proposes a hierarchical mitigation strategy ranging from file validation to manual version reversion.
Why did it fail?
Set the game executable to run in compatibility mode for or Windows 8 . System Check