"Reserved for future use" meets the Windows 10 registry LOL. One of my OCD friends who likes to "run a tight clean ship", did not like that he just excludes the entry, instead of [a] understanding it and [b] fixing it. Yes, I'm talking about the famous Speech Toast Notifier, interesting name...
The ironic thing is that I do definitely believe in registry cleaners, once a program [The 25th anniversary edition of Paragon's Hard Disk Manager] installed, and it was supposed to run at boot time (when Windows starts), but it did not - because the registry entry for it (in the RunOnce startup) had a mistake in it! Proof that we do need things like CCleaner, even if they trip up from time to time.
And thank you, whoever it was, for mentioning using a chainsaw when cutting the Sunday roast - wonderful image there LOL!