QMimeData has no restrictions on what the data can be.
The data might need some processing if it is not one of the things the class has convenience API for (images, URIs, text, HTML).
That might be an option. Windows might even have some facility to convert RTF into HTML.
You'll probably need to search MSDN for that, it is not unlikely that Microsoft has tools/libraries for that.
Cheers,
_
Bookmarks