Unable To Open Bigfile Bigfile.000 [repack] -

The "Unable to open bigfile bigfile.000" error is a common launch issue primarily associated with games using the Crystal Dynamics engine, such as the Tomb Raider series (including Anniversary Underworld , and the modern trilogy) and Deus Ex: Human Revolution

. This guide covers the common causes and step-by-step solutions to resolve it. Steam Community Common Causes Antivirus Interference

: Security software may flag the game's large data files as false positives, preventing the game from accessing them. File Corruption (Bitrot)

: Data segments within the "bigfile" can become corrupted during updates or through disk errors. External Drive Issues Unable To Open Bigfile Bigfile.000

: Running these games from an external hard drive sometimes causes "out of table range" errors due to drive formatting or lettering. Insufficient Permissions

: The game may lack the administrative rights required to read large archives. Step-by-Step Solutions 1. Verify Integrity of Game Files

This is the most reliable first step. It compares your local files against the official servers and redownloads any that are missing or corrupted. : Right-click the game in your Properties Installed Files Local Files The "Unable to open bigfile bigfile

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5. Repair Corrupted File

If the file is genuinely damaged:

• WinRAR can repair some multi-part RARs (Tools → Repair archive).
• HDD Raw Copy Tool may recover readable sectors from a damaged disk image.
• Recuva or TestDisk might recover lost companion segments.

3. Try opening with appropriate tools

• For split archives – Use WinRAR, 7-Zip, or PeaZip to open the first part (.001, .000) or combine them.
• For disk images – Try FTK Imager, OSFMount, or 7-Zip.
• For unknown data – Open in a hex editor (HxD, 010 Editor) to check file headers.

Solution 4: Use Command-Line Tools (Advanced)

For Linux/macOS users comfortable with the terminal:

# Check what type of file it is
file Bigfile.000
If it's a concatenated split set, combine all parts
cat Bigfile.000 Bigfile.001 Bigfile.002 > combined_output.bin WinRAR can repair some multi-part RARs ( Tools
Step 6: Scan for Disk Errors
If you suspect the storage itself is failing:

Windows: chkdsk /f X: (where X is the drive letter)
Linux: badblocks -v /dev/sdX
SMART tools: smartctl -a /dev/sdX

Recover data from the failing drive to a healthy drive before attempting to open bigfile.000 again.

Solution 1: "Run as Administrator"

Success Rate: High (for Steam/legitimate copies)
Difficulty: Very Low
The Fix:

Right-click the game's .exe file (or the Steam shortcut).
Select Properties > Compatibility tab.
Check the box "Run this program as an administrator".
Click Apply and try launching the game.


Verdict: This is the "turn it off and on again" of file permission errors. It works 80% of the time because it overrides Windows' security handbrake.

Advanced Solutions for Specific Tools