They are replaced sounds with the same name. Take a look at the "sounds.iwd" in the Zombie mod's folder.
Thanks for the tip.
But I want too keep the game intact by adding new files.
Is there a way too add new sound files too MoD.
Made the same MOD for CoD4 MW1 and the sound files are working!
Did the same way with CoD6 MW2 but sound files are not playing!
Made an newsound.csv in soundaliases folder,compiled the new mod.ff.
If I open mod.ff with ffviewer I can see the soundtables and strings but it just won't play the sound file.
Anybody have any solution?