Max, you *can* load and save RTF files using wxRichTextCtrl, but they will be stored as XML files. Just fire up the wxPython demo, go to the wxRichTextCtrl specific demo, launch it, go to the File menu, select Save As, then select "XML files" for File type and save the document.
Now you can load it back in by going to the File menu and selecting the Open command. In the Open dialog select "XML files" for File type so you can find the saved document.
Ah, just for a moment there you gave me some hope!
Alas, it doesn't work! The file is certainly saved in XML, but when it comes to loading it back again all you get is the XML code, and no nice formatting!
Max