You wake up in a house, you have no memories that you can think of. You look out the window and see a small town. You also have no memory of this town, you have never seen it before in your life. Although as you look around you see that there is no one. You have no idea what happened to the citizens of this town, but you do know one thing, there is no life in an direction you look. Everything has turned to stone. The ground, the houses and fences, everything… is stone cold.
Copy the zipped map file *as is* into your Saves folder. The next time you run Minecraft, the map will appear under your Saved Games.