Its mainly for the memory card which would be accessible as a drive under windows, the structure of the directories and files are available i believe in a util called booklistgen. I long ago gave up directly hooking up the librie to my pc and now use the sony memory stick. i can provide samples from mine if that would be any help
that way i can use the prs and my daughter can use the librie
oh and i have java source for the procedure from the yahoo librie group somewhere if that would help