GTA IV definitive edition from Steam looks windowed all of a sudden. Won't show as full screen. Anyone having this problem too? :( : r/GTAIV

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Should GTA 4 be remastered? : r/GTA

GTA 4 to return to Steam without GFWL in required update — could

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Grand Theft Auto IV: PC Version is a Buggy Mess; Here's How to Fix It

Nine years later, one feature in GTA4 has never been bettered

GTA 4 was removed from Steam because of Games for Windows Live

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How To Fix a Full-Screen Game That Keeps Minimizing