selected wbfs got nkit.iso

hi,

I downloaded a bunch of different images, selecting WBFS, but when I opened up the zip they turned out to be nkit.iso:

this includes:

Dance Dance Revolution - Disney Grooves (USA) (En,Es)
Nickelodeon Fit (USA)
Super Mario Galaxy (USA) (En,Fr,Es)
Super Mario Galaxy 2 (USA) (En,Fr,Es)
Super Smash Bros. Brawl (USA) (Rev 2)
Wii Music (USA) (En,Fr,Es)

Are these actually available to download as wbfs ?

thanks!