Ok let's say all your music in the folder : f:/music (and subfolders)
type in the promt: (tried to make it the way it looks like...)
code:
C:\Document and Setting\foaly>F:
F:\>cd music
F:\music>dir /w /s > list.txt
so basicly it's
code:
F:
cd music
dir /w /s > list.txt
that should make a list of all the files in the directory f:\music
I think I explained it way harder then necessary...
/ 
