Unable To Open Bigfile Bigfile000 Exclusive __top__ Jun 2026

Ensure the "Logon Account" used by the backup software has permissions (Read/Write/Modify) on the folder containing the file. While "Access Denied" usually generates a different error code, permission issues can sometimes manifest as inability to open files exclusively.

If you are facing this issue, community-tested solutions from Steam Support suggest the following hierarchy of fixes: Verify Game Integrity: Right-click the game in your Steam Library Properties Installed Files , and click Verify Integrity of Game Files unable to open bigfile bigfile000 exclusive