The full list of supported input/output formats can be found
in the FAQ. XMDF doesn't seem to be supported. Someone needs to create a conversion plugin for it to be supported. If you can and want to do the work yourself, ask in the development subforum to get started, if not, consider
making an enhancement request. Note that requests usually only get implemented if someone on the development staff has an interest in the enhancement, there's no guarantee you'll get what you ask for.