[racket] pb with play-sound procedure

hello,

I upload a game (dynablaster) in planet http://planet.racket-lang.org/display.ss?package=dynablaster.plt&owner=jeeve
(in local disk, the sound is OK)

but when we use it via Planet, play-sound procedure don't find the sound file

play-sound: file not found: "medias/explode.wav"  *

thanks for your help

jeeve