I do not understand .desktop files. The last time I used desktop Linux was so long ago I wasn't even using Linux I was using Solaris. Then I went headless only for Linux for awhile, and when I came back we were all expected to understand what a .desktop file is. But I do not. I do not understand what I am supposed to do with one. I do not understand how to create one. I tried creating one and it did not work. Can .desktop files use relative relative paths for Exec, Icon, and working dir? Why not