An increasing number of companies are making digital booklets available for download along with the music, usually in pdf format. It would be very useful to be able to include a link to this booklet file in the OCD entry for the cd. The play function already makes use of such a link, and users can manually manipulate this through the browse function; the play function calls an mp3 player (iTunes, WinAmp, etc). Why couldn't there be a way for users to establish a similar link to a pdf file that calls Acrobat reader?