First locate the gunz process in wpe. i hope you know how to do this.
next double click a free filter slot.
now you should see something like this.
Type in the same as you see in [SEARCH], leave [MODIFY] blank.
Check "Block", enter a filtername if you want and click on "Apply".
now just check the filter you want to use and click on the "On" Button.
Ok I'll add a premade filter for you.
Just load it into WPE.