Call of Duty 4 or COD 4 is a famous video game that enjoys immense popularity. To take the gaming experience of COD 4 to a new level, gamers can insert customized maps in the game. Installation of new maps is possible if you follow certain steps. The latest version of the patch should be installed on Call of Duty 4. Patch version 1.4 or a higher one is needed. To install the new map, a directory with downloaded files should be created in the installation directory of the game. In the mod directory, files with the extension .iwd files must be copied. To load maps, the game has to launched in multiplayer mode and then the installed Warfare mod should be enabled. With the requisite commands, COD 4 will install the new maps.