Press F1 for help
which tells you to press L for a list of presets
As to the preset names - the naming convention (starting with the author's name) has been defined ten years ago and I don't think it will be changed just to facilitate browsing in a directory containing 40.000+ presets. Better think about splitting them into different directories or maybe delete a few
http://forums.winamp.com/showthread.php?t=77057