xinput1_4.dll missing?

Hi Im developing on win 10 and have included xinput1_4.dll for controller support. It works fine. But some people who try my game get the error "xinput1_4.dll missing" even though they have directx installed. It can be related to running win 7 I now suspect (instead of win 10). Should these people have another file? When just adding the file "xinput1_4.dll" that I send (which works for me) it doesnt help them. And how would I compile my game so it works with both win 10 and other versions (such as win 7 and xp)? Thanks!