Mario Power Tennis (wii version) .sbn files

I asked about this a while ago but I never uploaded any files.

Anyways, the Wii version of Mario Power Tennis contains .sbn files, which I believe are the character models/court models for the game.

Here's one of them: https://nofile.io/f/bkQrQU5k2g0/koopa.sbn

I can't extract it from ntcompress.exe or BrawlBox.