Microsoft has released its “Latest, Greatest” ADMX files which work on all GPMCs (from Windows 7 and later).
They’re downloadable here: http://www.microsoft.com/en-us/download/details.aspx?id=36991
I’ve put together a video to help you check it out and understand it. It’s here:
PS: PolicyPak also uses the Group Policy Central Store. So, if you’d like to see a video for how we do that, here ’tis: https://www.policypak.com/videos/sph1irhpgdm