Under Virus & threat protection settings , click .
If the file is missing or corrupted, the platform launcher (Steam/Epic/Microsoft Store) can repair it.
Press Win + I → (Windows 11) or Update & Security (Windows 10). Rise Of The Tomb Raider Unable To Open Bigfile.000
Scroll down to and click Add or remove exclusions . Select Add an exclusion and choose Folder .
45% of cases
In the game's startup launcher menu, change the display mode from Exclusive Fullscreen to .
The file bigfile.000 (along with .001 , .002 , etc.) contains the bulk of the game's assets—textures, models, and audio. When the game executable tries to launch, it requests access to these files. If the operating system blocks access, if the file path is incorrect, or if the file is corrupted, the game throws the "Unable to open" error. Under Virus & threat protection settings , click
typically indicates that the game cannot read a critical archive file due to corruption, permission blocks, or incorrect installation paths . Immediate Solutions
Allow the process to run to 100%. If mismatches are detected, Steam automatically downloads clean replacements. For Epic Games Store Users: Fire up the . Find the game in your Library . Click the three horizontal dots (...) below the game icon. Select Manage from the context dropdown menu. Scroll down to and click Add or remove exclusions
typically indicates corrupted, missing, or permission-blocked game data files. Primary fixes include verifying game file integrity via Steam or Epic Games, renaming the file to force a re-download, and adjusting antivirus exclusions. For a detailed list of potential solutions, visit Steam Community unable to start game- bigfile bigfile.000! error