: You will need to source and place the following files into the \main folder of your installation: localized_english_iw07.iwd English audio and subtitle files.
Default path: C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 3 : You will need to source and place
If you are patching the game to play the Single Player campaign, the methods above are generally safe. However, modifying game files for the Multiplayer component is highly risky. : You will need to source and place