Steam will scan your folder, notice the missing .dll , and download the official one. 2. Check Your Antivirus Quarantine

By following these tips and troubleshooting steps, you should be able to resolve issues with the steam_api.dll file and enjoy a seamless gaming experience with Tomb Raider 2013 on Steam.

Typical causes:

Sometimes, your antivirus software is the culprit. It may have flagged the legitimate steam_api.dll as a "false positive" and deleted it.