Edit: Removed the "umount" stuff for lack of relevance (I have opened so many threads in the last few days that I lose track of them apparently. Sorry for that).

This is about opening files without about a lot of mouse clicks. If I want to open an executable file with an editor I have to click three times, which sucks. KDE apparently does not recognize the filetype (something that also annoys me in Mac OS X). I'd like to open the file right away in kate or kwrite for editing (If I want to run it I use ./<filename> or a link to the Desktop).

Well as we're editing posts to make things irrelevant, I'll make my post irrelevant too !

That has nothing to do with it, as $HOME/Desktop wasn't on my path the last time I looked. But I admit the question is badly formulated. I'll edit it.

Reply to smoker:
Your original answer was not to use system commands (like umount) as the names of custom scripts, if I recall correctly. If I try to run a system command from a desktop launcher without sudo I will certainly get an error, but it is usually possible to call ./<filename> (which will call a script in my home folder, whether or not it has the ".sh" suffix, which brings us back to the topic of recognizing file types) in desktop launchers even without choosing "Application in Terminal" (GNOME) or "Runs in terminal emulator" (lxshortcut), so that cannot have been the problem.

So your post was certainly relevant; I hope I have given a better answer now.