Library > Click the three dots (...) > Manage > Verify . 2. Delete the Specific Bigfile

Digital distribution platforms (Steam, Epic) download bigfile.000 as a single large chunk. Network instability or insufficient disk space can truncate the file. The error appears if the file size mismatches the expected value recorded in the game's manifest.

If you bought the game on Steam, corrupted files are the most likely culprit. Steam can compare your local bigfile.000 with the master copy on its servers and repair it.

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: Security software like Windows Defender or third-party antivirus may mistakenly block the game from reading large archive files. Add the Rise of the Tomb Raider installation folder as an exception in your antivirus settings.

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If validation utilities do not register the damage, you must force a manual rebuild:

The "Unable to open bigfile.000" error in Rise of the Tomb Raider

The client will notice the file is missing and download a brand-new copy. 5. Run the Game from a Virtual Hard Disk (VHD)