Didn't i already respond to this post or one similar to it? Im pretty sure i did, please use search next time.
Any way, heres your solution. The reason it only shows the mp3 files is becuase they dont want you to unselect any thing that is required in your game, only thing on the instaltion not required is that mp3 folder, thats why its the only thing there. I think that the esf team tried to idiot proof it so people wouldnt unselect. sounds harsh, but there are people who are dumb enough to do it, course thats just my oppinion. Once again, PLEASE use search next time.
Edit:
Oi, i took the time (about 5 seconds) to look for the previous post and here it is
http://forum.esforces.com/showthread.php?t=32890