Counter Strike 1.64 is not a game developed for the Nintendo 64. Counter Strike is a first-person shooter franchise and 1.64 suggests a version number. It's highly improbable to find a port of Counter-Strike 1.64 on the N64 due to the hardware limitations of the console. If this listing exists, it is likely a ROM hack, an extremely ambitious project, or a mislabeling of a different game. 

Counter Strike 1.64

Conker's Bad Fur Day PAL prototype