I requested a friend to share a particular song with me to add to my music library. She sent it as a M3u music file via email. When I attempted to open it I only had an PDF file and that didn't work. I searched and downloaded a couple of free apps but they appear to be for downloading music from the Internet. What app could I get that would allow me to share and receive music on my IPAD 2 and then store it to my music library?