Help me Mod my Steam bought version of CoD WaW please!!

I just downloaded the zombie map packs off of fileplanet.com and I can't figure out how to add them to my game so they are playable! I have them sitting in Win.rar but I can't figure out what to do from there. Please help me!Help me Mod my Steam bought version of CoD WaW please!!
there should be a readme file on how to install, read that.go to computer>c drive>program files>steam>steamapps>common>codwaw>*whatever folder the readme says to extract to*Then extract and ta-da you have the maps.Help me Mod my Steam bought version of CoD WaW please!!
The Readme had no info on how to do it =(
[QUOTE=''RuffRyder1516'']The Readme had no info on how to do it =([/QUOTE]name of the map pack your DLing?

Call of Duty: World at War - Fileplanet Zombie Mappack