Trying to find an application for 3ga :
"As far as I can tell, these file types are merely containers, and if you change the extension on the file to either mp3 or wav, the appropriate Windows media converter will open it without you having to do anything else at all.
So before going any further, I suggest that you try changing .3ga to .wav or .mp3 and see what happens - this might be easier than you think!"