The civil side might be different, but that is not what the parent insinuated. (And yes, my question to the parent was obviously meant to show that I disagree.)
They got your money; so it's obtaining benefit by deception. If it says in the product specification that it does something that it doesn't do then it's fraud, which is criminal.
It's a de minimis form of selling you a product that they know to not include the features they sold.
But, police wouldn't pursue it (they don't even bother with burglary under O(£1000s) in UK); but you could sue for lost damages and you should in theory be successful.
>if it's in the documentation anywhere
A quick search for "RegBack" doesn't turn up any MSFT documentation on it. But it does turn up an article titled "How to restore Registry from its secret backup on Windows 10". This makes me think the feature is undocumented.
I get the hunch MS is set on controlling the users configuration at all times. On the flipside i remember the hell of restore point trojans, and perhaps this is MS best go at mitigating a currently guesstimated threat that is coming?
Step one to editing the Registry is _stop editing the Registry._