...I think the old fashioned Windows style html help file is one of BIAB's better features. Quick and easy to navigate...
Ah, now I guess I don't tend to use that, so maybe I'm not seeing the best of what PGM do.
That's likely an unintended consequence of me working 90% of the time on Linux. I can read the .pdf manuals, and usually can read Windows .chm files on Linux, but I do forget to look for them. There seems to be half a dozen of them (on 2021). I just opened bb/Documentation/bbv.chm and it looks fine in Okular.