Registry Virtualization in Windows 10

Question

Where does Windows 10 keep its virtual registry keys?

I'm writing my first C# Project in Visual Studio and found out that when I write a key inside HKEY_LOCAL_MACHINE, Windows 10 actually writes the key elsewhere as part a virtualization process. I need to know where that elsewhere is.

It's not in the virtual store as someone notes in the background article https://social.technet.microsoft.com/Forums/windows/en-US/2125a783-12bb-4fce-8005-0c4b5d1edbad/hidden-registry-keys?forum=w7itproappcompat.