Windows 10 allows players to stream Xbox One games on PC, and Phil Spencer, the head of Microsoft's Xbox division, recently discussed the topic in an interview with Eurogamer.
When asked about the possibility of native ports of the Forza series on PC in the wake of Windows 10 streaming, Spencer highlighted player demand and how that affects the decision.
"There isn't a tremendous request today for racing games like Forza on PC," he said. "Obviously through the streaming we showed in January you'll be able to play on any of the PCs you have in your home. I don't want to build things because you can build them, I want to build things that our customers are asking for."
Although streaming doesn't entirely replicate the idea of a PC port, Spencer did go on to mention the PC versions of Halo and how Microsoft handles projects on a case-by-case basis.
So it seems Spencer doesn't rule out the possibility of PC ports of first-party Xbox One games, but Windows 10 streaming will obviously be a big focus. Time will tell whether that focus dominates Microsoft's vision of PC games.