Play audio from iOS documents folder with U3DXT

So I made it possible to export the audio to the documents folder of the game/app. The extension of the audio is MP3. I tried using WWW:

     WWW www = new WWW(MEEA.outputURL);
     audio.clip = www.audioClip;
     audio.Play();

But this crashed the game. "MEEA.outputURL" gives the directory to the audio, (..../documents/audio.mp3) Is there a way so Unity uses this audio file (in the documents folder) as an audiosource using U3DXT?