This is the "silent killer" of gaming sessions. The file name bigfile.000 can sometimes look suspicious to overprotective antivirus software (like Windows Defender, AVG, or Norton). The antivirus may quarantine the file or block the game from reading it, resulting in the "Unable to open" error.
To test this:
For Windows Defender Users:
If you still see the error, the problem might be deeper.
Move the game to a different drive. If your hard drive has bad sectors, the file may be unreadable. Try moving the installation to an SSD or a different HDD via your launcher (Steam has a built-in "Move Install Folder" feature).
Check your file path length. This is rare, but if your Windows username is very long and the game is installed in C:\Users\ReallyLongName\Documents\My Games\..., Windows can hit a path character limit. Try moving the game to a root folder like D:\SteamGames\.
If all above fails, your hard drive may be dying. This is rare but happens.
This is the "silent killer" of gaming sessions. The file name bigfile.000 can sometimes look suspicious to overprotective antivirus software (like Windows Defender, AVG, or Norton). The antivirus may quarantine the file or block the game from reading it, resulting in the "Unable to open" error.
To test this:
For Windows Defender Users:
If you still see the error, the problem might be deeper.
Move the game to a different drive. If your hard drive has bad sectors, the file may be unreadable. Try moving the installation to an SSD or a different HDD via your launcher (Steam has a built-in "Move Install Folder" feature).
Check your file path length. This is rare, but if your Windows username is very long and the game is installed in C:\Users\ReallyLongName\Documents\My Games\..., Windows can hit a path character limit. Try moving the game to a root folder like D:\SteamGames\.
If all above fails, your hard drive may be dying. This is rare but happens.