Playing Mp4 files???

Hello all, I recently purchased a Sansa Clip 4GB and loaded up a good bit of music on there. I also have a bunch of songs that I have ripped off Pandora (an online radio site) using Orbit music downloader. These files had to be saved in mp4 format, otherwise it would not work. Now my question is how I can make it so my clip will play these mp4 files. Do I need to convert it somehow and if I do, what would you recommend to use? These files are average mp3 size.

As far as I am aware, the Clip does not play files labeled MP4–you will need to convert or otherwise make them accessible to the Clip (sorry, I’m not very familiar with the MP4 label/format).