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A generic DLL from the internet might not match the specific version required by Dishonored , leading to game crashes or registry errors.

When searching for a fix, you will likely encounter websites offering standalone steam_api.dll files for direct download.

These files are frequently injected with malware, spyware, or trojans.

This is the most common cause. Antivirus software frequently flags crack files or modified DLLs as malicious and quarantines them.