Well, to make a long story short, my brother lost all of his saved data for Roller Coaster Tycoon Deluxe, including the Mega Park (unlocked after completing all twenty-one scenarios.)
He already tried this: (I'm not sure if the naming guest part is necessary, but I'll includ it):
"Name a guest Coaster.
At the Main Menu, hold SHIFT,type " rct2" and press ENTER.If done correcly,
you will hear clapping.
press A then B then on the number pad 35916473289641
and it will say congratulations you have reached the mega park."
However, he claims it doesn't work. Does anyone have the park unlocked, and has the save file(/s), (.sv4, .td4, .sc4, whatever,) with all scenarios completed, and would be willing to direct me to it/them, and knows which directory to put it/them in when the program is installed on a PC running Vista? Or a very quick and easy method of completing all twenty-one scenarios, possibly involving downloading other save files?