Be extremely careful. Downloading random .dll files from the internet is a primary way to get malware. If you must replace it manually:
Are you getting a (like 0xc000007b) alongside the DLL message, or does the game just fail to open?
Here is a straightforward guide to getting your game back online and the steam_api.dll working correctly. What is Steam_api.dll? alien vs predator 3 steam apidll work
If you see steam_api.dll there, select and add it to your "Exclusions" list so it doesn't get deleted again. Step 3: Reinstall DirectX and Redistributables
Newer versions of Windows 10/11 sometimes handle older DLLs poorly. Be extremely careful
Antivirus software is notorious for flagging steam_api.dll as a "False Positive" (especially if you are using certain mods). Open your Antivirus or settings. Check the Protection History or Quarantine folder.
Sometimes the DLL error isn't the file itself, but the environment it needs to run. AVP requires specific older versions of DirectX and C++. Here is a straightforward guide to getting your
Place the file in the main directory where the AVP.exe is located. Restart your PC. Why does this happen? Most steam_api.dll issues in AVP 3 occur because of: