Thanks for Jfm, it's good!
The source is kinda lame, you can't just implement parts, it's the whole jframe or nothing at all. This is a good program to get an idea of how to make your own explorer though, all the basics are here... I'd sugest making your own, you can make something just as good with less boilerplate. As a whole, I'll give a thumbs up as there aren't any other projects that are as far; and this project hasn't seen any attension in couple years to boot...