Incorrect file type

[Apollop]

Hey, I heard about this wii thing on Just Dance 3 and I thought I would give it a try. I installed and downloaded all the things that was on the tutorial but when I click on dolphin nothing happens. It asks me what to open it with and I don't know what to do. Does anyone know how I can fix this? It doesn't come up as a folder by the way.

[Anti-Ultimate]

Redump the game