Can Microsoft provide PC compatibility within the X1

[Machiavellian]

sabvre42 said:
And how exactly does that work ?

The overwhelming majority (almost all) games are designed in their own isolated application. They were also designed for PC specs and not for the XB1.

Also if you allow random PC games the ability to install themself on the XB1 -- you are opening up access to allow anyting on the system. Next thing you know, XB1 will need antivirus!

It would work the exact same way as running a Windows VM on a Mac or PC.  You run the VM and execute the application within the VM.  All of the overheaded needed to run a Windows PC are not needed just ability to execute a game.

Also just like the 360 BC, it would be on the approval of the developer and MS.