If it works, add the game’s installation folder to your antivirus and re-enable your protection. 4. Run as Administrator
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. Unable To Open Bigfile Bigfile.000
Temporarily disable your Antivirus (Windows Defender, Bitdefender, etc.). Try launching the game. If it works, add the game’s installation folder
Ensure you have at least 10–15 GB of free space beyond the game’s install size. If it works
Reinstall the game on a (preferably an SSD) to rule out hardware failure (bad sectors) on your primary drive.