The most common cause is "bitrot" or a corrupted section within the large .tiger files that the standard "Verify Integrity" check sometimes misses.
The "Unable to open bigfile.000!" or "Disc error while reading bigfile.000.tiger" error in Rise of the Tomb Raider is a frustrating roadblock that typically indicates the game can’t access its primary data archives. Whether you are facing a crash at startup or a "Failed to Start" message, this guide covers the most effective ways to get back to raiding tombs. 1. The "Delete and Re-Verify" Method (Most Effective)
Look for files named bigfile.000.tiger through bigfile.00x.tiger . rise of the tomb raider bigfile000 error better
Delete the specific file mentioned in the error (usually bigfile.000.tiger ).
Go to your Steam/Epic Games library, right-click the game, select Properties > Installed Files , and click Verify Integrity of Game Files . The launcher will now be forced to download a fresh, clean copy of that specific archive. 2. Bypass Antivirus Interference The most common cause is "bitrot" or a
Modern security software often flags the game's large data files as false positives, preventing them from opening.
Open your antivirus settings (like Windows Defender) and add the entire Rise of the Tomb Raider installation folder as an exclusion or exception . Go to your Steam/Epic Games library, right-click the
If the game lacks the administrative rights to read its own files, it may trigger a bigfile error.