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The most common cause is a corrupt bigfile.000 during the initial download or an update. Instead of reinstalling the entire game, use the built-in repair tools: Rise Of The Tomb Raider Unable To Open Bigfile.000
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The most common cause is a corrupted "Bigfile" that didn't download or install correctly. Steam has a built-in tool to detect and replace these damaged files. and go to your Right-click Rise of the Tomb Raider and select Properties Navigate to the Installed Files (or Local Files) tab. Rise Of The Tomb Raider Unable To Open Bigfile.000