Do not download steam_api.dll from random "DLL download" websites. That is a guaranteed way to get malware. Stick to the safe methods below.
Are you experiencing any secondary issues like or audio desynchronization ?
The game may be denied access to the file if Steam doesn't have proper permissions. Close Steam completely.
I'll start with a broad search for steam_api.dll. search results provide several potential sources. I will open them to gather detailed information. search results provide a good foundation. The CSDN article offers a step-by-step fix, the Baidu Baike entry explains what steam_api.dll is, and the 3DM forum post highlights a common issue with cracked versions. The Appuals article provides additional troubleshooting steps. The Steam Community discussion offers more solutions.