Make sure the PC and phone are speaking over your Irda link, then in windows explorer, pick your wav or midi file and right click... select "send file" and send it to "IR recipient". The file should then appear on the phone as an MMS message in your inbox. From there you can save the sound file to the phone and delete the MMS. The file will appear with the standard ringtones and will also be listed under "extras" "recorder".