album art does not come with files unless you download them with the file (if you so choose to download it from the user). album art comes from your media player downloading them from databases like cddb "gracenote".

users that make available album art are have either downloaded the whole file contents from another user (like an opennap based networks that allows downloading of folder contents eg slsk) or the user just has album art automatically downloaded and added to that "CD" folder.

here is a small FAQ/tutorial relating to the WMP album art database. this generally applies to all media players that are capable of accessing music databases (such as gracenote cddb).

http://www.faqfarm.com/Q/What_is_alb...w_does_it_work