I had sort of the same problem with my Samsung MP3 player. Out of the box the only way to use it is to sync it with Windows media player after looking around on the net I found a site that was helpful. There'a also a forum on this "Anything but IPOD site" for the Sansa.

Sansa M200 series

2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83