Thanks Cathy, I appreciate your assistance.
Okay, I make this modification to the target line and use that shortcut to start the Custom Edition version of the game. But on the menu that comes up there is only the option to play Multiplayer, not Single Player as I had hoped.
Is there a way around this? I don't want to play on the Internet - just my own little corner of the world. Any further suggestions? I feel that I am missing something that I should know.