> If they don't, do you know of any alternatives to look to?

keep an eye on

http://www.fast-help.com/

The guys there told me that in the incoming version 5 there will be full support for the new Microsoft help system
(hopefully... :-)

Actually version 4.x is a very good choice to produce winhelp, html help, pdf or rtf with a unique source.

Regards
Salvatore