In that the version of a particular game installed could be the same build seen on Xbox One hardware. A few weeks ago Microsoft posted a call-out to players to help them test and improve Windows 10 gaming, via a free copy of State of Decay: Year One. In order to participate people were required to be a part of the Insiders program and have access to the latest Windows 10 preview build.

The description itself was a little vague in that it made it sound like optimisation for Play Anywhere software and the further integration of Xbox into Windows 10.

We’re excited to bring technology tailor-made for gaming to Windows. Help us validate these systems work as expected, and play State of Decay for free (limited time only!). Just tell us about any problems you encounter with installing and launching the game. You’ll need to have a PC on a version of Windows 10 from the Windows Insider program that is 18329 or higher in order to participate in this playtest

Where it gets interesting is that the sleuths over at Thurott noticed that the game was being downloaded from Xbox servers. Weird.

"Instead of downloading from the Microsoft Store server, serverdl.microsoft.com, where all content comes from including PlayAnywhere titles, the game downloads from assets1.xboxlive.com."

Not only that but the file format, .xvc is specific to Xbox One games. It's an interesting move, and one that will make it a lot easier to bring Xbox One games to PC and to close the gap between Windows 10 and Xbox One when it comes to Xbox-specific games.