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.
If the above steps don't resolve the issue, consider the following:
The error “Unable To Open Bigfile.000” usually means your current program does not recognize the file format, the file is incomplete, or associated segments are missing.
To resolve the issue, follow these steps: