Tim Sweeney, a lead developer with Epic Games, behind the industry-leading Unreal game engine, once again raised concerns in a recent interview with print-magazine "Edge," that Microsoft is systematically killing digital distribution platform Steam, by deliberately eroding the reliability and longevity of the Win32 programming interface for PC versions of Windows, in favor of its UWP (universal Windows platform), through updates to the OS.

Microsoft, Sweeney argues, is carefully avoiding big changes to the way third-party software is distributed and used on Windows, but is definitely seen to be taking small strategic steps, "sneaky maneuvers," that could lead to Windows Store either monopolizing all third-party software distribution on the platform, or worse, making it the only way you can get third-party apps. The rising reliability issues affecting Steam, a Win32 API-based platform that distributes Win32 software, Sweeney claims are telltale signs of that dark future of the PC platform. Microsoft's biggest argument in favor of UWP is that software is inherently more secure, since it's sandboxed (covered in abstraction layers and virtualized by the OS) even further.Below is an excerpt from the "Edge" interview.

How exactly do you think Microsoft is locking down the PC to make it a closed platform?
There are two programming interfaces for Windows and every app has to choose one of them. Every Steam app - every PC game for the past few decades - has used Win32. It's been both responsible for the vibrant software market we have now, but also for malware. Any program can be a virus. Universal Windows Platform is seen as the antidote to that. It's sandboxed - much more locked down. The risk here is that, if Microsoft convinces everyone to use UWP, then they phase out Win32 apps. If they can succeed in doing that then it's a small leap to forcing all apps and games to be distributed through the Windows store. Once we reach that point, the PC has become a closed platform. It won't be that one day they flip a switch that will break your Steam library - what they're trying to do is a series of sneaky maneauvres. They make it more and more inconvenient to use the old apps, and, simultaneously, they try to become the only source for the new ones.

Given that Steam is so widespread and popular, how could Microsoft truly win that battle, in terms of games at least?
Slowly, over the next 5 years, they will force-patch Windows 10 to make Steam progressively worse and more broken. They'll never completely break it, but will continue to break it until, in five years, people are so fed up that Steam is buggy that the Windows Store seem like an ideal alternative. That's exactly what they did to their previous competitors in other areas. Now they're doing it to Steam. It's only just starting to become visible. Microsoft might not be competent enough to succeed with their plan but they are certainly trying.

Isn't it the case that Microsoft is simply mimicking Apple's model, given how lucrative it's proven to be for software distribution?
Sure, that's the motivation. They're trying to copy Apple's model, but they realise you can't just flip a switch. It has to be achieved in small step changes.