It is a campaign/single play scenario with a story,multiple factions,secrets,good mapping,quests, side quests. i recommend just trying the map out. The story is about the vikings coming to Scotland to search for King Edward Longshanks! he is a very rich king and you would like to take everything from him!
Put the files from the 3 folders into your age of empires 2 folder with the same name. example:
put the AI files in your aoe2/AI folder.
sometimes a player will make their diplomacy neutral to you, this will sometimes happen at the start of the game. if that happens re-start the map to fix it.