If you own the game on Steam, use the built-in repair tool to automatically download the missing file. ThinkMobiles Open your Steam Right-click on Call of Duty: Black Ops III and select Properties Installed Files tab and click Verify integrity of game files Steam will scan for missing components and re-download steam_api64.dll ThinkMobiles Method 2: Check Antivirus Quarantine
The first step is to verify the Steam client files. This process checks for any corrupted or missing files and replaces them. If you own the game on Steam, use
Sometimes the file gets deleted or corrupted outside of Steam's verification. Sometimes the file gets deleted or corrupted outside
Tip: If this happens repeatedly, add your Black Ops 3 installation folder to your Antivirus "Exclusions" list. If you own the game on Steam, use
To fix the steam_api64.dll missing error in Call of Duty: Black Ops 3
If the game is from an unofficial source, the crack itself might be incomplete or for the wrong version.