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Has anyone had any experience with GO and Windows API/win32?

I haven't tried it, but you might want to look into WALK(Windows Application Library Kit):

Is designed to provide a Go-ish interface for win32.

Actually, that's mainly a UI toolkit interface. Not Win32 core . (Though a tiny bit of core stuff is included)

Sorry, I'm not familiar with Windows stuff. This library might be more what you have in mind then: