somewhere in the process, the TYPE and CREATOR tags of the files are lost, especialy when you get a file that was located on a PC. What i have done, and i works beautifully, is i made a litte drag and drop utility that automaticly changes the tags of the downloaded mp3's, so the file is recognized a an i-tunes file. Altough you can set it to any application you want.

You too can make a uitility when using filetyper, a useful little app you can download at:

http://www.ugcs.caltech.edu/~dazuma/filetyper/

good luck!