Rise Of — The Tomb Raider Unable To Open Bigfile.000

Fix: Rise of the Tomb Raider “Unable to Open BIGFILE.000” Error

One of the more frustrating errors encountered when launching Rise of the Tomb Raider (particularly on PC) is the “Unable to open BIGFILE.000” message. This error prevents the game from starting, often appearing immediately after clicking “Play” on Steam or hitting the game executable.

Benefits:

  1. Anti-virus or ransomware protection – Security software blocks the game from accessing large archive files.
  2. File permission problems – Windows prevents the game from reading the file (often after a moved or reinstalled game).
  3. Partial file corruption – An incomplete download or update damaged the archive.
  4. Mod conflicts – Some mods that modify BIGFILE.000 can break the file structure.

Conclusion

The “Unable to open BIGFILE.000” error in Rise of the Tomb Raider is rarely a sign of permanent corruption. In nearly all cases, it is caused by security software blocking file access or insufficient permissions. Disabling Controlled Folder Access or running the game as administrator resolves the issue for over 90% of affected players. Rise Of The Tomb Raider Unable To Open Bigfile.000

  1. Open the Xbox App.
  2. Select the game and choose Manage.
  3. Select Files > Verify and Repair.
  1. Open Settings > Windows Update > Update history > Uninstall updates.
  2. Search the list for any of the KB numbers listed above.
  3. If present, right-click and select Uninstall.
  4. Restart your PC (do not skip this).
  5. Pause automatic updates for one week to ensure Windows doesn't reinstall them immediately.