Instructions
Click the "Start" button and click "Computer."
Double-click the hard drive where "Age of Empires II" is installed.
Navigate to the "Program Files (x86)\Microsoft Games\Age of Empires II\Scenario" folder.
Place the scenario file into the folder by either copying it, cutting and pasting it or dragging and dropping it in.
Launch "Age of Empires II."
Select "Custom Scenario" from the main menu.
Select the scenario you just added to the "Scenario" folder to begin the game on your custom scenario.