Call of Duty 4 on mac

I cannot find cod4 codes/error or something like that to play the application.I have got the Cod Liver Oil , and when I open it , it opens up a little window.Well , in this window there are 2 folders.A readme folder and the other's the call of duty 4 game I have downloaded.Well , I open it , and it tells me  to  put call of duty 4 folder in the applications.Well , I do it , and then I try to locate it.Then , I locate it and then I double-click on it.And then , it says that I must put this cod4 folder in the cod4 application!WTF!?!?!?Why it says that?I haven't got the application to put the cod4 folder.I try to put it in the Cod Liver Oil folder , but it doesn't work.Well ,  if I open the readme folder in the Cod Liver Oil folder , it says some strange and awesome codes and info or something , well , it says also how many GB I need to install cod4 in my Mac OS X , and these kinds of info.But , it doesn't say how to play it!!!

  PS:Can you tell me in the comments of my blog how to get and locate cod4 application and then play it on my MACOSX?Please comment and rate(put funny , good or interesting).