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Assassin's Creed IV Black Flag Window Mode Patcher by jim2point0.
Copy it to your AC4 install directory, launch it, type y and press ENTER. Patching will start.
Pressing only enter will give you info about current mode.
Patching again will revert all changes.
Taken from: http://www.deadendthrills.com/forum/discussion/55/guide-assassin-s-creed-4-black-flag