Multiple xp bf 3 zlo config

Hi guys, i'm opening a server on my own and i wanna use double exp in my server. I read in some topic they said include " -PointSystem.PointsMultiplier 2x" to Scrips/Win32Game.cfg but when i try it doesn't not work. Anybody can tell me how to do it in my server ? I use Zlo server bf 3.

Thanks !

Correct: -PointSystem.PointsMultiplier 2

No Correct: -PointSystem.PointsMultiplier 2x

Pretty simple is not enough to use "X"