"Unable to Open Bigfile.000" Rise of the Tomb Raider typically indicates that
: Click the three dots on the game tile > Manage > Verify . Rise Of The Tomb Raider Unable To Open Bigfile.000
: Security software (like Windows Defender) sometimes flags large game files as false positives, preventing the game from reading them. Add the game's installation folder to your antivirus exclusion list "Unable to Open Bigfile
: This error can be triggered if your drive is full or your PC runs out of RAM while trying to unpack the large archive file. Ensure you have at least several gigabytes of free space on your installation drive. Rise Of The Tomb Raider Unable To Open Bigfile.000
If none of the above works, collect: