My understanding is that `wad`s are specifically for the Wii (and Google seems to back me up on that), so regardless of where they got it from the fact that it

My understanding is that `wad`s are specifically for the Wii (and Google seems to back me up on that), so regardless of where they got it from the fact that it was a `wad` means they were playing the Wii version. If it was an actual Wii U version it would be some other format.