Hi,

what format are your music-files? If you choose the Open-button in BB, you'll only be able to select Band-in-a-box songfiles or melody-files (SGU or MGU -filetypes):

(images removed by Mahahaavaahava as not needed any longer)

If your files are of another type, you need to select a different Open-command from the File-pulldownmenu: (Like MIDI or Generic Audio-files e.g. MP3)

(images removed by Mahahaavaahava as not needed any longer)

If you select the Open Audio-option, you'll be able to select all audiofiletypes from your desktopfolder that are supported by BB.

HTH, Petri
(I think this is your problem...?)