Problems updating garmin oregon gps
A file set can include a sound file and/or an Icon file * files in a folder other than the POI sub-folder on the device will be read in the alphabetic order of the folders on the device.
There was an excellent post by bear009 that should bear on this subject of the order of folders and files that appear on the device.
At some point Garmin decided that the expense of licensing the ability to play .mp3 files was not profitable. It has been said that the file must be PCM, 44.100 k HZ., and 16 bits, Mono and that a stereo wav file will not work.