I would
check here and see if you can find a solution to your problem, and let us know if you get it to work.
Just FYI, here's the complete list for everyone:
Fully Supported
Players listed here are equipped to play both unprotected and protected audio files, right out of the box.
iRiver
H10 (5GB, 6GB, and 20GB)
Supported
Players listed here work with Xbox 360 but may require a firmware update available from their manufacturer's Web site. The update may or may not allow supported players to play protected as well as unprotected audio files through Xbox 360.
Apple
iPod, iPod Mini, iPod Nano, iPod Shuffle
(Note: in order to play unprotected AAC files, all iPod players require a free download from Xbox Live Marketplace using Xbox 360: "Optional iPod Support")
Creative Labs
Zen Sleek, Portable Media Center, Zen Vision, Jukebox Zen Xtra, Zen Touch, Zen Micro, MuVo NX, MuVo TX - FM, Zen Nano Plus
Dell
Pocket DJ
Gateway
MP3 Photo Jukebox
iRiver
Portable Media Center, IFP-790T, IFP-890T (256MB), U10, T10, H320/340
RCA
Lyra RD1072A
Rio
Carbon, Forge
Samsung
PMC, YP-T5 YEPP (256MB), YP-MT6, YP-T5V/XAA
SanDisk
Sansa e140
Sony
PSP
Unsupported
Players listed here use a proprietary protocol that is not supported by Xbox 360.
Archos
Pocket Video Recorder
Creative Labs
Jukebox 2, Jukebox 3, Jukebox Zen, Jukebox Zen NX, Nomad IIC (64MB)
Gateway
DMP-X20
iRiver
IFP-140, IFP-180T, IFP-195T, IFP-340, IFP-380T, IFP-590T
Rio
800, Cali (256MB), Chiba, Eigen, Fuse, Karma, Nitrus, Riot
Samsung
YP-910