If you purchased the game on Steam, do not download any files. Steam has a built-in mechanism to automatically scan, find, and replace missing or corrupted core files. ThinkMobiles Steam Client and go to your Right-click on Call of Duty: Modern Warfare 2 and select Properties Navigate to the Installed Files Local Files

If you recently installed the game or an update, your antivirus might have "eaten" the file. Open your antivirus software (e.g., Windows Defender). Navigate to or Quarantine . Locate steam_api.dll and select Restore .

This is the official and safest method to replace any missing or corrupted file. Steam will scan your installation and automatically download only the necessary parts. Open your .

, you generally do not need to download the file from a third-party website. These errors usually happen because your antivirus quarantined the file or the game files are corrupted. 1. Check Your Antivirus Quarantine