Rise Of The Tomb Raider Unable To Open Bigfile.000 Updated -

The "Unable to open bigfile.000" error in Rise of the Tomb Raider typically indicates that a massive core game data file is missing, corrupted, or blocked by system permissions

Run as Administrator: Right-click the game's .exe or desktop shortcut and select Run as administrator to bypass potential Windows permission issues . Advanced Troubleshooting Rise Of The Tomb Raider Unable To Open Bigfile.000

2.1 File System Permission Denial (45% of cases)

When the game is installed to a protected directory (e.g., C:\Program Files), Windows User Account Control (UAC) may prevent the game from opening the file for read access, especially if the game is not elevated. This is exacerbated by: The "Unable to open bigfile

1. Go to your game installation folder (right-click Rise of the Tomb Raider in Steam → Manage → Browse local files).
2. Right-click on RiseOfTheTombRaider.exe → Properties → Compatibility.
3. Check Run this program as an administrator → Click OK.
4. Next, locate BIGFILE.000 in the same folder.
5. Right-click BIGFILE.000 → Properties → Security.
6. Select your username → Ensure Read & Read & Execute are allowed.
7. Click OK and launch the game.

1. Uninstall the game.
2. When reinstalling, choose a file path that is short and contains no special characters.