zombiepack3

quick question as I never have a problem downloading add-ons and
getting them to work as they usually seem all set up for me.

I downloaded the new farmland zombie pack 3. I extracted it and 2
files came(no readme). the zombiePBO one whioch was called
"FML_HP3.PBO"
and then the other file,"zombiescript.PBO". I put them both in the
addon folder.

the zombies show up in the editor, I choose myself as a west soldier
and the zombies show up as east so they are red and I am green so we
are enemies everything seems like it should.

problem is as you can probably guess,although they show up and look
cool and creepy as hell they dont attack me. is there a protocal I
missed? such as maybe putting the zombiescriptPBO in the wrong folder?
or something?

thanks ahead of time if you have any idea!