Start with Fix #1, work your way down, and you will be climbing ice walls and fighting bears in no time.
Diagnostic Analysis and Remediation of the "Unable to Open Bigfile.000" Error in Rise of the Tomb Raider Rise Of The Tomb Raider Unable To Open Bigfile.000
To resolve the Bigfile.000 error, follow these step-by-step troubleshooting guides: Start with Fix #1, work your way down,
: Ensure the game executable is allowed through the Windows Firewall. Administrative Permissions and Compatibility Start with Fix #1
Temporarily disable your antivirus software to prevent any interference with the game's files.
If you’ve tried all solutions and the error persists, check official support forums or contact Crystal Dynamics—but in most cases, one of the steps above will have you raiding tombs again within minutes.