The easiest way to unzip a .rar file is to download a program called 7zip, install it. Once it is installed when you right click the .rar you should see an option called 7zip, if you move your mouse over it you should see an option "Extract to Final.Orginity v0.1.3" Click that option, once 7zip is done extracting a file you should see a new folder with "Final.Orginity v0.1.3" as the name. Your game will be inside that folder.
Alternatively, if you do not want to download any extra software,you can create a new folder in your downloads, move the .rar in to that new folder and then right click the .rar and you should see an option labelled Extract All.... If you click that you should get your game extracted to taht folder.