If you’re trying to mod a file extracted from the game, extract it fresh again. If you downloaded a mod, the mod archive might be broken – redownload from a trusted source.
Overly aggressive antivirus software or background overlays can interfere with the game’s ability to read its own data. How to Fix "Telltale File Validation Failed" on PC 1. Verify Integrity of Game Files (Steam & Epic) telltale file validation failed
Would you like help specific to a particular Telltale game or modding tool? If you’re trying to mod a file extracted