Professional WLMP Converter to convert Windows Live Movie Maker project file to AVI, MP3, MOV, MP4, MPG, DivX, XviD, WebM, H.264, HD video, etc.
WLMP Video Converter can be downloaded with easy step-by-step guides at:
http://www.techisky.com/how-to/wlmp-converter-convert-wlmp-file-to-avi-mpg-mp3.html
The guides also applied to convert WLMP on Mac OS X.