Working on an audio-book version of Shoes

Hiya everyone! I've been trying to create an audio-book version of my story, Shoes. I've been using a program called Record Producer by Voyetra. I've got the whole story recorded in .rpp format, but for some reason, the program won't save it as a .wav or any other format most people can use. Is there anyone out there who knows how to turn convert my recording into something a bit more useful?