The error "Unable to open bigfile.000" means that the game’s executable cannot read this master archive. Possible reasons include:
Verify file exists, then launch game.
– Clears temporary file locks.
Click the three dots (...) under the game tile > Manage > Verify . shadow of the tomb raider unable to open bigfile.000
If verification fails to detect the issue, manually rename the bigfile.000 file in your installation folder to something like bigfile.000.old and then run the verification again to force a fresh download. 2. Configure Antivirus and Permissions The error "Unable to open bigfile