Not that I know of. There is a stock RichEdit control included with Windows, which many dialogs and apps use, but only if they are very basic. Other apps use a great variety of controls and components, based on different technologies (native COM, .NET, even Delphi!).
Furthermore, good integration requires quite a bit of intimate knowledge of not only the edit control, but also of the app. ":w", ":e" or even simple things like 'u' can become enormously complex if they are to be done well.
Nowadays, and after the Word & Outlook experience, I believe the only worthwhile investment is in widely popular IDEs. The demand is just not that big for other apps -- what could be more extended than Word and Outlook? And still, if I went back, I wouldn't have done the Word version. I'll maintain it, but it's just not worth the huge effort given the number of sales.
Of course, the cause might be that I'm making some other mistake, such as undermarketing or having a too steep price, but things are the same for the VS version too, and that one sells much better.
Sorry about the negativity, I wish things were different!
-- Jon