Topic on Talk:Metal Gear Solid 2: Substance
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I managed to get it working using Xinputplus. The controls and vibration work seamlessly. Yes, even the triggers.
HOWEVER.... there is a caveat. In order to work, Xinput plus generates some dll files, in this case, dinput8.dll is needed. If you want to use the widescreen patch, this will be a conflict. I havent figured out a way around this yet.