As we all found out, it does not work:( But there is a solution, to use an injector to basically trick the game into thinking that you are using a quad processor. If you are like me you are probably using a dual core processor to play Far Cry 4. Or see below if you want to add it to your steam libary. You might make a shortcut of the batch file and save it to your desktop.
Download new version of Extreme Injector v3.7.