Here are the most effective solutions, ordered from the most common and simple to the more advanced.
If verification didn't work, do it manually.
How to Fix the "Unable to Open Bigfile.000" Error in Rise of the Tomb Raider Rise Of The Tomb Raider Unable To Open Bigfile.000
If verification fails to fix the issue, a clean reinstallation might be necessary. However, there's a more effective way to do this than a standard uninstall/reinstall loop:
Click on the (or Local Files ) tab on the left. Click Verify integrity of game files . Here are the most effective solutions, ordered from
Try these solutions in order, starting with the easiest fixes first.
file is damaged or incomplete due to a failed download or disk error. Security Interference: However, there's a more effective way to do
Scroll down to and click Add or remove exclusions . Click Add an exclusion and choose Folder .
: Security software blocks the engine from opening high-capacity .000 archives.