First thing you are doing wrong is using Desktop Manager 4.2. Your BB does not have 4.2 OS so you cant utilize the media feature in Desktop Manager.
Im not even sure your BB will play adp, probably only midi.
Try this, go to www.coolservice.dk/en/compatibilities.php from your computer, then it will let you upload your ringer and then give you a code to put into this link from your BB... wap.coolservice.dk.
Let us know if you have any other questions.