I had the same problem but I decided in the end to play it at 1080p on a 28" monitor. I sacrifice clarity (a bit) for still a decent resolution.
I agree that support for 4K is almost non-existent especially in Windows 7 software.
For others interested in buying cheap 4K monitors be careful of the advertising. I got a ViewSonic on boxing day and really got screwed as it's 30fps at 4K.
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#Steam AliasWL%Streak
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