compleate newbie needs help

[Frowl]

i'm really new to this so i dont know much about how it works, so here goes. I've downloaded a no/cd crack for Age of Mythology but when it's downloaded its in a RAR file (what ever that is) so i have no idea how to put it into the folder where the game is installed, do i need to change it into an .EXE file? if so how do i do it?

cheers