If you downloaded the file as part of a well-known mod (e.g., from Nexus Mods or the Far Cry Modding community) and you trust the source, it’s generally safe. However, like any DLL that injects code into a game, it could potentially trigger anti-cheat software (though Far Cry 5 has no active competitive multiplayer anti-cheat, caution is still wise).
file is a core component of the Far Cry 5 engine. Common causes for this error include: Antivirus False Positives Fc-m64.dll Far Cry 5