Yeah I don't know about the whole breaking win32 stuff -- Microsoft has done similar before but breaking win32 would put their entire business market at risk. That being said, I do think they will favor UWP going forward. Most of the new features will be centered around UWP apps and they are going to do everything they can to retain control over UWP. IIRC you're going to be able to get UWP apps through the steam store though -- so I'm not sure it would end up mattering anyway. Regardless Epic's new UE build can publish to UWP now, came out like yesterday. So I'm sure Tim Sweeney is having a bit of a mental crisis right now. He's contributed so much to gaming though -- if he wants to go off every once in a while I think people should just tolerate it. Unreal Engine pretty good. https://en.wikipedia.org/wiki/Embrace,_extend_and_extinguish That's just one example. That's why I kind of find it funny that people make it sound like it's so far fetched. At the time Netscape Navigator had a huge marketshare, like 80%. Then Microsoft used it's monopoly in other products, like office, to break the view on netscape. They did the same thing with Active X controls. Which basically forced people to use IE for compatibility. It's pretty much identical to what tim is saying here -- although breaking Win32 is a little more of a risk then breaking office the way they did.