The most common cause for this error is a corrupted or missing file. Instead of reinstalling the entire game, let your launcher find the missing pieces. Open your Library . Right-click on the game (e.g., Rise of the Tomb Raider ). Select Properties > Installed Files . Click Verify integrity of game files .
If the error happened right after an update, the update itself might have been botched in the cache.
Go to Steam > Settings > Downloads and click Clear Download Cache . This will restart Steam and require you to log back in, but it often fixes file pathing issues. 6. The "Last Resort": Manual Reinstallation Unable To Open Bigfile Bigfile.000
Ensure you have at least 10–15 GB of free space beyond the game’s install size.
Here is a comprehensive guide on how to fix this issue and get back to your game. 1. Verify Integrity of Game Files (Steam/Epic Games) The most common cause for this error is
If it works, add the game’s installation folder to your antivirus and re-enable your protection. 4. Run as Administrator
This error usually occurs when the game’s engine—often the Foundation Engine used by Crystal Dynamics or Eidos-Montréal—fails to access its primary data archive. "Bigfile.000" is essentially a massive container that holds the game’s textures, sounds, and models. When the game can’t "see" or read this file, it simply refuses to launch. Right-click on the game (e
Temporarily disable your Antivirus (Windows Defender, Bitdefender, etc.). Try launching the game.
The "Unable to open bigfile bigfile.000" error is almost always a . By verifying your files and ensuring your antivirus isn't blocking the game, you can usually fix the problem in under 10 minutes.