In 90% of cases, in the game's launcher settings fixes this error instantly. If that fails, administrative privileges and file verification are your next best bets.
Disable overlays from Discord, Steam, or NVIDIA GeForce Experience, as these sometimes interfere with how a game takes control of the screen. 5. Update Graphics Drivers
An outdated GPU driver can struggle to hand over "exclusive" control to the game engine, leading to a handshake failure. unable to open bigfile bigfile000 exclusive
Sometimes security software flags large data archives as suspicious. Add your game folder to the Exclusion List in Windows Defender or your third-party antivirus.
The most common culprit for this specific error is the "Exclusive Fullscreen" setting in the game's launch options. While this mode is designed to give the game priority over system resources, it often clashes with modern Windows display drivers or background overlays. In 90% of cases, in the game's launcher
This error essentially means the game engine is trying to access its primary data archive ( BIGFILE000 ) with "exclusive" read/write permissions but is being blocked by another process or a system restriction.
Troubleshooting the "Unable to Open Bigfile BIGFILE000 Exclusive" Error Add your game folder to the Exclusion List
If you’ve encountered the error message you’re likely trying to run a game or application—most commonly associated with Square Enix titles like Tomb Raider , Deus Ex , or Hitman —and finding yourself stuck at a crash-to-desktop or a black screen.