The error usually occurs due to one of the following reasons:
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If Steam's core files are corrupted, verifying the game files might not work. Reinstalling Steam refreshes the global registry paths for API files. Close Steam completely. Press Windows Key + R , type appwiz.cpl , and hit .
Alternatively, you may need to place it in C:\Windows\System32 or C:\Windows\SysWOW64 . Frequently Asked Questions Where should I put the steam_api.dll file? dishonored steamapidll is missing
Placing unverified binaries into your Windows system folders risks corrupting operating system processes.
Often, Windows Defender or third-party AVs mistakenly flag this file as a threat and quarantine it.
This almost always indicates a "false positive." The file's behavior (e.g., being a modified "crack") or the location it's found in can trigger heuristic scans. Updating your antivirus definitions to the latest version often resolves these false positives. If not, you can report the false positive to your antivirus vendor. The error usually occurs due to one of
In persistent cases where the file is present, unquarantined, and permissions are elevated, the issue is likely a corrupted dependency chain, specifically the Microsoft Visual C++ Redistributable packages. The steam_api.dll does not operate in isolation; it calls upon runtime libraries that manage memory and process threading. If the 2010, 2013, or 2015-2022 Redistributable packages (both x86 and x64 versions) are missing or damaged, the DLL will fail to load. The solution here is not to reinstall the game but to navigate to the _CommonRedist folder within the Dishonored installation directory and manually run the vcredist installer. Repairing or reinstalling these foundational components rebuilds the environment the DLL needs to function. As a final recourse, users may execute the System File Checker ( sfc /scannow from an elevated command prompt) to ensure no underlying Windows corruption is interfering, though this is rarely necessary for a Steam-specific DLL.
If you see steam_api.dll listed, click it and select > Restore .
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Once done, restart your PC and launch Dishonored through Steam. The error will be gone.
Before downloading or reinstalling anything, check if your Anti-Virus (AV) blocked the file. Open your or your Anti-Virus app .
Find in the list, right-click it, and select Uninstall .