The error "Unable to open bigfile.000!" in typically indicates that the game cannot access its primary data archives. This is often caused by corrupted installation files, antivirus interference, or insufficient administrative permissions. Quick Fixes to Try First
typically occurs because a core game archive is missing, corrupted, or blocked by system permissions Primary Fix: Verify Game Integrity rise of the tomb raider unable to open bigfile000 top
This is a rare but critical cause. The bigfile.000 file is larger than 4GB. If you installed the game on an external USB drive formatted as or exFAT , those file systems cannot handle single files over 4GB properly. The error "Unable to open bigfile