Call of Duty 4 Modern Warfare Pc Game Free Download. Call of Duty 4 Modern Warfare 1 (known as the Call of Duty: MW1, also known as COD: MW1 Modern Warfare 1 or simply MW1) is the eighth main appeal play services and the fifth developed by Infinity Ward. This is the sequel to Call of Duty Modern Warfare 2, and the last installment of the Modern Warfare series.