Legend of Zelda - Twilight Princess (GC)

[TGE]

Actually the wii version came first but seeing the file formats I think they developed it for the Gamecube, then changed their mind and decided to port it to the wii and release the wii version first. After that they used the original files to port it back to the Gamecube that's why I think it uses gamecube formats. One thing though is that TP uses a newer version of the arc format. That's why it cant be extracted directly with rarc but must be converted to .rarc to extract them. Very confusing at first though since I didn't know how to extract them.

Wasn't TP ported to the wii though?

It was developed for both. However, it's essentially the same game, which means the same engine, and same model format. BMD and BRRES are two entirely different formats, so they wouldn't just change the format between versions.