Help with editing game files/creating mod

[AboutTreeFitty]

To summarize, I'm trying to edit the files so that any bite from a zombie is an instant kill.

 

As far as I can tell I've followed the process correctly yet no changes are taking place in game.

 

I have opened up the zombie_data_params.scr folder from Data3 in 7zip, extracted to desktop, opened in notepad++, increased the grab-bite-damage multiplier from 2.0 to 100.0, then 10.0, now 5.0, then placed the edited zombie_data_params.scr back into Data 3, overwriting the previous version, but whenever I enter game there is no damage multiplier being applied to the grab damage. I still take the same amount of time to be eaten. What am I missing? This should be a simple edit from my understanding, yet I'm not getting any results and getting frustrated.