I saw a post in here where the OP said it helped his C Drive so I thought I'd try it. I know W10 does it by its self, but in some cases better safe than sorry.
But certainly NOT in this case. You do deserve credit for your determination toward solving the bizarre problems you've created for yourself
Oh, you even bad mouth by using M$ & not MS, I understand.
Well, throughout the seven odd decades of my life, the initials "MS" have always been associated with the horrible disease "Multiple Sclerosis", which is still around, and was around long before the Microsoft corporation even existed.
If you want to play mental games, or feign indignation like the whiny SJWs, millennial troll/brats, and self righteous acolytes of Microsoft that inhabit this forum, that is, of course, your prerogative.
All companies approaching monopoly status are comparable to invading armies, and they'll use any form of mental manipulation, and whatever underhanded or overt tactics necessary to maintain and advance their agenda.
Microsoft was, and occasionally still is, the world's richest company. The same is also true of their former CEO and founder, who for many years was the world's richest single individual.
Therefore, "M$", is a long standing, appropriate, easily identifiable abbreviation, and internet meme. Which I'll continue to use with or without your approval.
I take into account specific actions on the part of any corporation to determine if they're being reasonable in their dealings, or forcing an agenda on their customers.So, I judge M$ on its individual "battles", not on its overall conduct of the "war". Windows 10 was blatantly rammed down the throats of Windows users by the latest sociopath in charge, Satya Nadella. While I';m sure you think this was a voluntary act of good judgment and common sense on your part, trust me, I'm sure they brought in psychologists and business analysts to engender that response for the largest majority on their victims. Oops sorry, I meant customers.
They are beginning to market Windows as a service, which IMHO, is a trial run on determining if they can force a subscription model on the majority of people who really don't have another company they can go to for an operating system.
As for your defragmenter utility, I would want to install it into Windows 7, to find our if it works correctly in that environment.. Should that be the case, you could almost bet that M$ has d!cked around with the Windows 10 APIs, in a long game tactic to close up the system to outside publishers.
BTW, I have no intention of doing so. I've been happy with the performance of M$'s disc management utilities thus far. Let's just say now that I'm older, some of my spirit of adventure has abandoned me..