TRichView.com

I'm having trouble trying to convert RVF files that contain TRVIPNSubDocument to RTF.

When I try to load one of these files using TRichView.LoadRVF, it raises a EClassNotFound exception: 'Class TRVIPNSubDocument not found'.

Has anyone else dealt with the same issue and if so, is there anyway to convert these files?

TRVIPNSubDocument is not TRichView class, so I guess this is a Delphi component inserted in TRichView.
Do you have this component?
If yes, call RegisterClasses([TRVIPNSubDocument]) before the first RVF loading.