I created a playlist a while ago using stock music player. I remember struggling to back it up and I used an app called BlueMuze. Bluemuze was great for getting the playlist it just saved it with a 4 letter extension that was unicode or some thing. I think it was .m3u but dont remember the 4th letter, Anyway, I have flashed my phone many times since so the playlist can't be on internal memory and must be on the sd card since Doubletwist sees it and plays it. No other music player including stock or bluemuze recognizes it. I searched m3u and the actually name of the playlist, even using windows search with the phone connected to pc and nothing. I have no idea where this playlist is that Doubletwist is able to play.