Fixed! Little late... sorry about that.
In 2017 the last of the MP3 codec patents expired, but I understand that this is old software and may not be worth revisiting on your end. Keep the donation but if ever you get a chance to re-export the build with that filetype supported please do!
I can't seem to preview MP3 filetypes with this, WAV plays just fine (shows the little progress bar on the bottom) but not MP3s (no bar on bottom). Any idea why this might be the case? Half of my files are in MP3 format :(
