Ah, so it is an addon - I thought so. No big deal, you just have to remember that you have the addon running in your version of the game.
I realised years ago that you could do all sorts of wierd things with addons. For instance, since an addon can be just a config, and since a config can run scripts, you could make an addon that took away everyone's weapons at the start of the mission.
This might not be very useful
but you could do useful stuff instead, such as replace in game soundeffects, change all recoils etc.
It's all good !
roni