Right-click on the main game executable file () and select Properties . Open the Compatibility tab. Check the box for Disable full-screen optimizations . Check the box for Run this program as an administrator . Click Apply and OK .
Because bigfile.000 is incredibly large, the game temporarily caches components into your computer's system memory (RAM) and virtual memory paging file during startup.
Right-click Shadow of the Tomb Raider in your Library →right arrow Properties →right arrow Installed Files →right arrow Click Verify integrity of game files . shadow of the tomb raider unable to open bigfile.000
Close the Epic Games Launcher completely via your System Tray. Press Win + R , type %localappdata% , and hit Enter. Open the folder.
When Lara Croft’s world is carved from light and shadow, the game’s files are the scaffolding that holds those ruins together. Encountering the error message “Unable to open bigfile.000” mid-play is like finding the gates to a long-buried temple sealed by an invisible fault: the architecture is intact, but the path to exploration is blocked. This exposition examines what that message means, how it interrupts the player experience, and practical ways to resolve it so the game can return to its designed balance of risk, discovery, and flow. Right-click on the main game executable file ()
Diagnostic steps (what to check first)
Navigate to and click Verify integrity of game files . Check the box for Run this program as an administrator
The "Failed to Open BIGFILE.000" error in is almost always solvable with patience. In 99% of cases, performing a Verification of Game Files or Whitelisting the game in your Antivirus will resolve the issue immediately.
Have a different fix that worked for you? Let me know in the comments below. Happy tomb raiding!