Motorola E815 / E816 Hollywood

I take a 18 second clip of an mp3 file and email it to my phone. I make sure the file is less than 12 characters and is less than 300k. When I attach it to an email and send it to my phone it is an of mp3 format. When it gets to my phone and I save it to my phone it reads qcp file and I am not able to set them as ringers. Help?? What am I doing wrong. Why does my phone read the mp3 and say it's a qcp file???? Anyone suggestions are welcome. thanks.