This directory is used for sound files to play after certain actions.
WAV or other sound files can easily be convert to MP3 using one of many
free Audio Conversion tools, examples can be found here
http://www.portablefreeware.com/index.php?sc=39&s=100 - for example
FlicFlac is also an AutoHotkey application and very easy to use
http://www.portablefreeware.com/index.php?id=2534

Also read the notes in the configuration menu.

