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#1
You would have to use a Third party application like Classic Shell or a Theme that will work on Windows 10.
Quizo's Qttabbar (free) lets you set different colours in different areas of file explorer - and thus also affects some parts of Control Panel windows (also implemented by file explorer).
No way to do that directly in Windows. You could try high contrast themes.
How to change FileExplorer(windows explorer)background to Grey - Windows 10 Forums
#4
@THX1138, are you talking about the "hidden" UWP File Explore version?
It's buggy as heck, and really doesn't do much.
They have been working on it for ages now,
but....
Here is the shortcut for it: UWP Explorer.zip
Unblock in properties, and extract to your desktop.
The only things you can open from it are anything that uses another UWP app, like music with groove, or pictures with Photos, or the 3D stuff with it's app.
system32 stuff like a text file will not open.