As you can see I've been working on a "huge" project (DokuAdmin Explorer) to configure a even more huge project (DokuViz) -I'm not the author of the latter- I guess you can already understand the name of my project.

This person (DokuViz's author) wanted the program to have an interface similar to the Windows Explorer, with all the Drag&Drop, Copy-Paste and stuff available.

Here's a screenshot of it: