As far as I can tell, nobody has ever created an open-source replacement for winhelp, which is a bummer. So many early Windows programs relied on it to display help, and right now I don't have a legitimate way to make it work.
Microsoft did provide a version of winhelp that ran as late as Windows 8, but I can't get it to run on modern systems, and it has modern dependencies.
Maybe I can just try to get the Win2k version running. I see it's a 16-bit program. Would be an interesting test of my implementation in a more general way. It's laid out of kind crazy, with 102(!) segments, though the import list doesn't look too nasty. Something for later experimentation I guess....