Once joined, determine the actual format:
After simulating this error across different environments, here is what likely actually happened:
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
: 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 Unable To Open Bigfile Bigfile.000
Troubleshooting "Unable To Open Bigfile Bigfile.000" If you are a fan of modern gaming franchises like Tomb Raider, Deus Ex, or Hitman, you may have encountered the dreaded error: "Unable to open bigfile bigfile.000."
This error usually occurs when the game’s engine—often the Foundation Engine used by Crystal Dynamics or Eidos-Montréal—fails to access its primary data archive. "Bigfile.000" is essentially a massive container that holds the game’s textures, sounds, and models. When the game can’t "see" or read this file, it simply refuses to launch.
Here is a comprehensive guide on how to fix this issue and get back to your game. 1. Verify Integrity of Game Files (Steam/Epic Games)
The most common cause for this error is a corrupted or missing file. Instead of reinstalling the entire game, let your launcher find the missing pieces. For Steam Users: Open your Library. Right-click on the game (e.g., Rise of the Tomb Raider). Select Properties > Installed Files. Click Verify integrity of game files.
Steam will compare your local files with the server and automatically download any missing or corrupted "bigfiles." For Epic Games Users: Go to your Library. Click the three dots (...) next to the game. Select Manage and then click Verify. 2. Check for Disk Space and Drive Format
"Bigfile.000" is exactly what it sounds like: big. If your hard drive is nearly full, the game might struggle to allocate the memory or temporary cache needed to read it.
Free Up Space: Ensure you have at least 10–15 GB of free space beyond the game’s install size.
Check Drive Format: Ensure your game is installed on an NTFS formatted drive. Older formats like FAT32 have a 4GB file size limit; since "bigfile.000" often exceeds 10GB, a FAT32 drive will physically not be able to handle the file, causing it to corrupt. 3. Disable Antivirus and Firewall Once joined, determine the actual format: After simulating
Sometimes, overly aggressive antivirus software flags bigfile.000 as a "suspiciously large" unknown file and blocks the game's access to it.
Temporarily disable your Antivirus (Windows Defender, Bitdefender, etc.). Try launching the game.
If it works, add the game’s installation folder to your antivirus Exclusion/Whitelist and re-enable your protection. 4. Run as Administrator
Permissions issues can prevent the game executable from opening large archives located in the C:\Program Files directory. Navigate to the game’s installation folder. Right-click the game’s .exe file. Select Properties > Compatibility. Check Run this program as an administrator. Click Apply and launch. 5. Clear Download Cache
If the error happened right after an update, the update itself might have been botched in the cache.
On Steam: Go to Steam > Settings > Downloads and click Clear Download Cache. This will restart Steam and require you to log back in, but it often fixes file pathing issues. 6. The "Last Resort": Manual Reinstallation
If verification fails and the file keeps appearing as "missing," your installation path might be corrupted. Uninstall the game. Manually delete any leftover folders in steamapps/common.
Reinstall the game on a different drive (preferably an SSD) to rule out hardware failure (bad sectors) on your primary drive. Few error messages are as cryptic and frustrating
The "Unable to open bigfile bigfile.000" error is almost always a file communication issue. By verifying your files and ensuring your antivirus isn't blocking the game, you can usually fix the problem in under 10 minutes.
The error message "Unable to open Bigfile.000" is a common frustration for PC gamers. It usually appears when launching a game or trying to load a save file.
Since you asked for a "review" of this error, I will break it down by what it is, why it happens, and how to fix it, rating the difficulty of each solution.
Few error messages are as cryptic and frustrating as "Unable To Open Bigfile Bigfile.000". If you are reading this, you have likely encountered this alert while attempting to access a large archive, a virtual machine disk, a disk imaging file, or a segmented backup set. This error typically appears when software (such as file archivers, backup utilities, or low-level disk editors) tries to read a file with the .000 extension—often part of a multi-part file sequence—and fails.
This article provides a definitive, step-by-step guide to diagnosing why you cannot open Bigfile.000 and how to recover access to your data.
Before diving into the error, it is crucial to understand the file you are trying to open.
Bigfile.000 is typically the first segment of a split disk image or segmented archive. Large forensic images or virtual hard drives (often several terabytes in size) are frequently broken into smaller, more manageable chunks. Common naming conventions include:
The extension .000 is often generated by tools like FTK Imager (when creating a raw DD image split into segments), dd (using the split command), or WinRAR/7-Zip in multi-volume mode.
The error "Unable to open bigfile bigfile.000" therefore means that the software expected to find a valid, complete, and accessible first segment of an image chain—but failed.