The error message in Rise of the Tomb Raider typically indicates that a critical game archive is missing, corrupted, or being blocked by system security . The bigfile archives contain the majority of the game's assets, and the .000 file is the primary volume required for the game to initialize. Recommended Solutions How long is Rise of the Tomb Raider? | HowLongToBeat
: If verification fails, navigate to the game's installation directory and delete the bigfile.000 file manually. Then, run the verification tool again to force the launcher to download a fresh, uncorrupted copy. Rise Of The Tomb Raider Unable To Open Bigfile.000