[Treo] Concerting Palm's PDB audio files to MP3

[Andrew]

I took some audio of my daughter playing violin, & have set it as her ringtone. 
 My wife, who has a Blackberry, would like to do the same. Unfortunately, the 
files are on our computer in the PDB format. Can anyone tell me how to convert 
these to MP3 for her phone?
 
Thx. -Andy P.