I can't find windows lib int the platform folder, so I don't think the AppGameKit MAC version can release windows games.Is there anyone give me a hand?

No you can't do that.

If I copy the lib for windows to the platform folder, can I release windows version?

You can develop your game on the Mac, but to deploy to Windows you will need to get Windows up and running and compile your game using Visual Studio. The main thing is to get a project created and then copy all your code and media in, after that you should be set to compile and see it all working on Windows.

I see.Thank you!