Help on sound mod.

I want to try to make a custom sound for the headshots but i dont know how to modify these.. if you can help me i could release it, too. thanks.

\Z8Games\CrossFire\rez\Snd2\english\Message

and the replace the sound you want to have with Headshot_BL or Headshot_GR
it must be a .wav file

You moddificating the voice you mean?

changing the sound Headshot... for another thing I hope you will like it does this work it i save it as .mp3 and change the extension for .wav after ?