Re: "Upgrading users should be able to ignore the viewer as before."
Am I being foolish here or are you? Or is it the article that is incorrect? I'm pretty sure that WinHlp32 is used to open .hlp files, .chm are handled by hh.exe. So if the article is correct, then its only really old help files that become unavailable, and those who what to can use .chm as usual. Personally I quite like .chm and Help and Manual makes it a breeze to create them.