Unable To Open Bigfile Bigfile000 Exclusive

The error message "unable to open bigfile bigfile000 exclusive" typically indicates that a software application—most commonly games from the Tomb Raider series ( Anniversary Underworld ) or Marvel's Avengers —cannot access a critical data archive.

• Stale Processes: A previous backup job crashed or was killed improperly, leaving a "ghost" process holding a handle on the file.
• Job Overlap: Two separate jobs (e.g., a backup and an auxiliary copy) are trying to access the same bigfile chunk simultaneously. The software’s internal locking mechanism (lock files) might be out of sync with the actual file system state.

• Windows Defender:

  If the above steps do not resolve the issue, consider: unable to open bigfile bigfile000 exclusive