The engine's name was not publicized until IGN was told at the E3 2009 by the studio that Call of Duty: Modern Warfare 2 would run on the "IW 4.0 engine".
当时引擎还没有一个正式的名称，直到工作室在2009年E3游戏展时向IGN透露使命召唤：现代战争2将会运行在“IW 4.0引擎”上。