This error is most common on because legitimate copies require the API to interact with Steam’s servers. However, users with cracked games sometimes see this error if their crack is outdated or if antivirus removed the crack’s steam-api.dll . If you have a pirated version, please note:

If you are on Windows 10 or 11 and you have never messed with your security settings, this is likely your culprit. Microsoft introduced "Controlled Folder Access" a few years ago to stop ransomware. The problem? It thinks Black Ops 2 is ransomware trying to encrypt your Documents folder.

Open elevated Command Prompt and run:

today I'm going to show you guys how to fix if you're getting an error saying the Steam_API.dll. is missing error on your Windows. YouTube·MDTechVideos

Based on the diagnosis above, the resolution requires bypassing the two main obstacles: Permission and Protection.

Before you refund the game or reinstall Windows, know that this is a solvable permission error, not a broken game file. Below is the definitive guide to fixing the "Cannot create steam-api.dll" error in Black Ops 2.