Homebrew help with extracting files from system menu wad

[korben546]

I need help with extracting the files from a system menu wad when I extract it i get 000000000.app and 00000001.app I also get the .cert .tik .tmd and .trailer files I need to extract the .app file but whenever I try with showmiiwad it tells me file is no valid u8 archive and u8 tool tells me runtime error "5" . i need to get these extracted so I can look at the files contained within.