The map is protected so you can't open it directly in the editor. The only way is to drag&drop the map into your starcraft II.exe file. If you want you can play it on B.net (EU and NA servers)
This map is freely inspired to Dungeon Keeper 2 but all the game will be transported to the starcraft universe. That means that all DK units, rooms and spells will be converted in SC2 units, giving them similar roles and abilities as they had in the original game.
Your objective is to dig underground to expand your hive and defent it from the invading terrains that will try to destroy you.