Actually, WordPad knows how to save the text in Unicode. It's a bit strange, that you cannot directly command it to do just that.
Usually, you can just open the document in WordPad, then:
SelectAll->change font to, say, Times New Roman->set "Script" to Western->Save
The above procedure is usually sufficient for the WordPad to convert a Cyrillic document into Unicode, readable by Connect Software and the Reader. (Connect Software has a bug of not being able to show Bold and Italic non-Latin characters in RTF).
I tried using
RTFUnicode on a file from the
Aldebaran library, and it didn't seem to do much (said it converted 11 characters). However the RTF autogenerated from FB2 is not generally readable by Connect at all, the program crashes when it tries to open it. MS Word and WordPad are OK with it, though. So, it may be uncommon compressed format (its size is about 1/2 of the same text saved by Word or WordPad, and about 1/4 of the same text in Unicode).
RTFUnicode seemed to work just fine on a standard, generated by Word or WordPad non-unicode Cyrillic RTF file.