Suggestion from a clueless person (me):
Try renaming a .xml "doppleganger" into a .mp3 file (just change the extension). after you're done, try playing the file into any of the mp3 players you may have and see what happens. Post back the results. Don't be too angry at me (especially if something bad happens...)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-