You have to create a server and load the map to the server.
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It depends on the map.
-579322790607890076 is the seed and the map is custom
to play a map, open minecraft, then click singleplayer, choose the world, then click play selected world.
Custom maps? You will have to setup a server, download the map and replace "world" folder with the custom map (Must be renamed to "world".) Or you can play on my server and we can set something up. I will setup world file and all that. Just tell me the map and your IGN! (In game name.) Email me at: dave_robertson@mail.com
I don't know. I don't play Minecrap. It's Minecraft and to do so open the download with winrar and copy the map into your saves in your .minecraft folder