How to open a .unity3d file

i love the game Motocross nitro . i used to play it on miniclip http://www.miniclip.com/games/motocross-nitro/en/ its a online game i have a internet problem i wish that i can play it offline so i opened the source of the page and saved the game it was .unity3d file

i downloaded the UniPlayer v1.33 and opened the file . when i opened it , an error came error was

error launching Unity Player
invalid Unity web file(Decompression Failure)

this game is one of my favorite

Idk about UniPlay but the unity player checks whether the file is executed from where it was intented or it does not work. Also I assume a big company like miniclip doesn’t want people to distribute around their content so they might have taken some precautions to ensure that doesn’t happen, preventing you from just playing it offline.