To fix the steam_api64r.dll missing error in Mortal Kombat X
_CommonRedist folder.DirectX folder and run DXSETUP.exe.Method 2: Reinstall Steam API
Reinstall Visual C++ Redistributables: Sometimes the error stems from missing system components. Download and install the latest Visual C++ Redistributable packages from the Microsoft Support site. The Story of the Ghost in the Machine
If none of the above work, consider these last resorts:
Look for a recently blocked item related to steam-api64r.dll. Select Actions > Restore.
1. Verify Game Files (Steam)