It was in the post immediately below this one ;*) Still, it is hilarious they used zip. A lot of N64 games use gzip/zlib with funky headers. Another interesting one to open is Blast Corp, as it contains fully-headered gzip files which can be detected by some archive tools.
It works, doesn't open in winrar but it does in 7-zip. Interesting.
Isn't that surprising they used gzip (if thats what it was) nice free and fast compression library, they had to get as much data as they could on those tiny cartridges!