lol or you could just rename it to .mp3 and it should work fine.
First make sure that your computer shows the extensions. To do that, click start >> control panel >> folder options. Choose the View Tab, Now uncheck - "Hide extensions of known file types"
Now you can see the extensions, then you know, rename the file.
change it from song.mpga to song.mp3
this only works becuase a .mpga file is a .mp3 file and vice versa. you cant go around switching .wav and .mp3 or .mpeg and .avi it just wont work.