In the era of "Jump Maps," "Deathrun," and competitive "Search and Destroy," custom assets are everywhere. Without a properly configured fileSysCheck.cfg :

seta fs_checkOnLaunch "1" seta fs_verifyHashes "full" seta fs_ignoreCorruptAssets "0" seta fs_reportMissingFiles "1" seta fs_generateManifest "fs_game/manifest.mw4" seta fs_autoRepairFromCDN "1" seta fs_logVerbose "1"

This setup catches 95% of game-breaking errors without the 3-minute boot delay of a "full" hash check.

Remember when fileSysCheck.cfg appeared in the files for Black Ops Cold War two months before its official reveal? The community dismissed it as a dev error. We all know how that turned out.