KDE3 and later with Fluxbox. At first I thought that files are opened by appropriate applications not by their extension as in Windows systems but according to their Magic Numbers. I do not have to tell you how much disappointed I was when I learned the truth �� You may want to check other articles in the FreeBSD Desktop series on the FreeBSD Desktop – Global Page where you will find links to all episodes of the series along with table of contents for each episode’s contents. TL;DR Its a short story about cleaning the mess that XDG does and also using custom