I assume that I open the command prompt window and type "Lha x executiv.lha dh1:"
That is, as long as you have a program called "Lha" to run. Maybe it's called Lharc or something else. And, you gotta have the unarchiver program in your path somewhere if it's not in the current directory. Maybe there's a help function if you do like "lha -h" or even just "lha" (or whatever it's called) by itself without any arguments.
It's fun to learn Amiga! :-D
