Just to add to nhockaday's reply, in case you want to use other recording (or audio editing) software, all BrillKids software support .mp3, .wav, and .wma audio file types.
If you need detailed instructions on how to use the Easy Voice Recorder in LR or how to create customized lessons for LR and LM, do visit our Support page and do a quick search to find what you need:
http://support.brillkids.com(you may also access LR and LM manuals from the Support page as alternative to using the ones inside the software)