Answers: dvdvideosoft from download.com will convert it
mp3 is an audio format profile. You've probably mistaken it next to mpeg4, which is a video codec.
There are bunch of programs that convert from one format to another.
do a dig out for rm2avi or smth similar to this. Google have lots of programs.
correct luck
As you want to convert RM to MP3, that you may to extract audio from RM video.
I aways use Daniusoft Video to Audio Converter which a friend recommend me. It could convert audio from any popular video formats to MP3 and other audio formats. Also it consent to you adjust settings to control the record size.
You can free download it here to hold a try:
http://www.daniusoft.com/video-to-audio.
Here is a guide to enlighten you how to convert it:
http://www.daniusoft.com/tutorial/video-...
If you still enjoy question step to find more here:
http://answers.yahoo.com or move out me an email.