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...I'm using Win3.11 for Commodore 128 HDD...
Turns out I was wrong, The Windows 3.1 SDK does in fact define WM_MBUTTONDOWN and WM_MBUTTONUP. No built-in applications use it, and very few other applications do either.Obviously, a proper driver would be needed. (that's why you are here).All we know is that it's a serial mouse with three buttons. That isn't a lot to go on.
So, I have only Win3.11 on CD with MS Word & Excel + MS-DOS 6.22...