If you play Mafia II: Definitive Edition and experienced “Missing XINPUT1_4.DLL” error on Windows 7, This guide will help launch the game, Let’s check it out.
Solution
Just download XINPUT1_4.DLL file and put into Mafia II Definitive Edition/pc/ directory.
Download Links
mediafire: Link
Mirror: https://yadi.sk/d/TG6Xh8H7gt88TQ
Note: This file obtained from x360ce controller wrapper and have valid digital signature.
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Credit to steveballmer