HTML Help for typelibs

In the July 99 MSDN under the MIDL Language Reference, it says that the helpfile attribute sets the name of the help file to use for a type library. The example shows a winhelp file (.hlp), and we have code that implements this attribute as a winhelp file. However, when I specify a compiled help file (.chm) for the help file, I get a VB error - Unable to display help file. The help for the error box suggests that the hh.exe file needs to be in my path. It is. Any ideas? Has anyone implemented context sensitive HTML help for type libraries?

Thanks,

Melanie Baeske
Unigraphics Solutions, Inc.