How to install:

First go to you Call of Duty 4 main folder. Probably located at C:\program files\activision\call of duty 4 - modern warfare\main
under 64-bit it's located at C:\program files (x86)\activision\call of duty 4 - modern warfare\main

Now you must rename some files:

Rename iw_00.iwd to localized_english_aa.iwd
Rename iw_01.iwd to localized_english_aab.iwd
Rename iw_02.iwd to localized_english_aac.iwd
Rename iw_03.iwd to localized_english_aad.iwd
Rename iw_04.iwd to localized_english_aae.iwd
Rename iw_05.iwd to localized_english_aaf.iwd
Rename iw_06.iwd to localized_english_aag.iwd

This is for the english version, if you have an other language installed you should replace the 'english' with that language.

Now you need to create a new .zip file into the main folder (same folder).
make a new map inside the .zip called images and now rename the .zip to: localized_english_aw07.iwd
make sure you change the .zip extension to .iwd!!

Now you can put the modded files into the localized_english_aw07.iwd folder and you'll be done.
This also works for other mods.

To remove a skin simply delete the skin file (.iwi) from the images folder.


For people how don't know how to open the .iwd files you can open those files with winrar.