Steam can automatically detect and redownload missing system files. Open your . Right-click Call of Duty: Black Ops III . Select Properties > Installed Files . Click Verify integrity of game files . Wait for Steam to replace the missing DLL. Reinstall DirectX and Visual C++ Redistributables
The steamapi64r.dll error stops Call of Duty: Black Ops III from launching. This error usually means your antivirus software deleted the file by mistake. It can also mean your game files are corrupted. Steam can automatically detect and redownload missing system
If the problem persists, the issue might not be with the game itself but with the Steam client. Reinstalling Steam can fix deeper issues with the platform's components. Uninstall Steam via "Add or Remove Programs" in your Windows settings, then download and install the latest version from the official Steam website. Select Properties > Installed Files
Download both the and x64 versions ( vc_redist.x86.exe and vc_redist.x64.exe ). If the problem persists
If you still see the error after all four methods, check for:
Look for an entry related to steam_api64r.dll or your game folder. Select > Restore .