Aspose.Words 18.104.22.168 includes Beta of RTF and WordprocessingML import features. The download is available here http://www.aspose.com/Community/forums/ShowThread.aspx?PostID=62813
You can try this:
Document doc = new Document(MyPath + “MyFile.rtf”);
Document doc = new Document(MyPath + “MyFile.xml”);
Note that ability to export to RTF and WordprocessingML is not Beta, these features were released in Aspose.Words 4.0.
To save in RTF or WordprocessingML do this:
doc.Save(MyPath + “MyFile.rtf”, SaveFormat.Rtf);
doc.Save(MyPath + “MyFile.xml”, SaveFormat.WordML);