Add the Dishonored installation folder to your antivirus "Exclusions" list to prevent it from happening again. 3. Reinstall DirectX and Visual C++ Redistributables
Before you go downloading files from random websites (which you should do), let Steam fix itself. Steam has a built-in "self-repair" tool that scans your game folder and automatically replaces any missing or corrupted files, including the steam_api.dll. Open your Steam Library . Right-click on Dishonored . Select Properties . Go to the Installed Files tab. Click Verify integrity of game files . dishonored steamapidll is missing
Steam will compare your files to the master copy and auto-download the missing .dll . 2. The "City Watch" Intervention (Check Antivirus) Add the Dishonored installation folder to your antivirus
This error will prevent you from launching the game entirely. For a game as atmospheric as Dunwall, this error feels like a corrupted whale oil tank—it stops everything cold. Steam has a built-in "self-repair" tool that scans
But the safest method: