Suggestions on handling help in dlls

I have a VB6 application (linked via automation to VBA in Visio). This has a help file (chm) that can be called up by a help button on all my forms.

However, I now have some functionality that has been split out into a separate dll (as this may become a .Net COM interop dll). This dll has some forms and I'm not sure the best way to handle the help for this as obviously I can have circular references between my dlls. Am I stuck with the dll having to have its own separate help file. I would prefer not to have to handle a callback either.

Looking for any suggestions/ideas?

Thanks