Even if you don't use third-party AV, Defender can silently block files. Go to Windows Security > Virus & threat protection > Protection history and look for a "Threat blocked" entry related to Tomb Raider.
This is the number one culprit. Antivirus software—especially Bitdefender, Avast, Norton, and even Windows Defender—often misidentifies bigfile.000 as a threat. Why? Because the file is large (often 10GB+) and contains compressed, executable-like data. Heuristic scanning algorithms see a massive file that "behaves" like an archive and flags it as ransomware or a trojan. The antivirus then quarantines or deletes the file without asking for your permission. Rise Of The Tomb Raider Unable To Open Bigfile.000
Aggressive antivirus software often flags large, compressed game files as suspicious "containers." This prevents the game from opening them. Even if you don't use third-party AV, Defender
(Steam/Epic/GOG) and fixes #1-4 fail, contact the platform's support. If you are using an unofficial copy , delete everything and purchase the game. The error is a direct consequence of tampering with the archive structure. Heuristic scanning algorithms see a massive file that
The error message "Unable to open bigfile.000" Rise of the Tomb Raider typically indicates that
