Well what we would need it as well a possibility for .odt files as for the totally crazy new RTF. I hate them more than ever before for changing a 25 year old, well working exchange format to a new standard. They broke up all interoperability with that. Even in Open Office you have to select now "RTF for Old Computers" what a pity (again: for a exchange format).
Sadly Pangery cannot help us as they told me 2 years ago, ... perhaps if more people ask them?
In every case their "converter" is nice and wirth the $20 if you need to work with such files.