Still not working
Did you even look in the console?
I tested your script and I'm surprised no one noticed that the "description.txt" is actually "description.txt.txt". And same goes for the .gui.gui that Furling pointed out.
You have a misunderstanding about file extensions. You either have to change options on your OS to display file extensions or you have to change it in the file's Properties.
Now when you try to open the GUI you will get console errors, and I can't help you with that.