I bought one after I saw it on sale in GameStop but when I started up KI it doesn’t work. I thought this game had universal XInput support. I only bought this because I don’t know how to make my Fighting Commander 4 work in the game (and the PDP Mortal Kombat X FightPads are wishy-washy).
On console no
If You want to use Your PS3/PS4 Hori Fighting Commander 4 joypad on XBOX One, You can use the Brook PS3/PS4 to Xbox One converter:
http://www.brookaccessory.com/Archive/_eng/products/p0003/1503251498.jpg
http://www.brookaccessory.com/detail/03946072/
It seems You can use the converter to use a PS3/PS4 controller on a PC as well:
For use with a PC running on Windows 7 please install the original Xbox One driver from Microsoft. Older operating systems are not supported.
https://www.reddit.com/r/killerinstinct/comments/4ds61j/fightstick_converters_for_ps3ps4_sticks/
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Bless.
Well obviously not on console, I meant on PC.
Though, having Xbox 360 compatibility should have been a thing for KI, IMO. The 360 controller is the same as an XB1 controller, unlike the DualShock 3 and DualShock 4. Adding USB compatibility for 360 fighting hardware would have been appreciated.
Oh man, Hori is bringing their Fighting Commander series to Xbox One for Tekken 7! Problem solved!
Hey, that is great news. I’ve been playing KI with the Hori Fighting commander PS3/PS4 on XB1 since the Brook adapters came out. Perfect 6 button layout and switchable shoulder buttons joypad to play KI with on XB1 and PC 
A new option is nice (assuming it works), but let’s not let them off the hook on this. Many have 360 controllers that should work and used to work, that now don’t. That is still a huge problem.
I suppose I am speaking more for myself than the community at large. I only just stumbled on this issue with 360 FightPads.
Yes, that’s what I posted…were you reading the other posts?