Scrollbar skinning can work again on Windows 10 with an Open-Shell nightly build 4.4.147
A member "bonzibudd" noticed that scrollbar skinning still works in search view, but not in the programs tree view.
With that information, a coder "ge0rdi" managed to fix the issue (changing from "m_hWnd" to "hWnd") so now a skinned scrollbar can work for Win10 as well as on Win7,8,8.1
So Ivo's included 7 style Metro, Metallic,& Midnight skins can work as designed.
Not all skins have skinned scrollbar bitmaps and text information.
There are some user modified skins that have them included like "Tenified(fixed)" or "Bad Dudes" port or "Flagship Revived" port,
"DARKMATTER-SUBSPACE Revived" port and "XenoMorph" port.
On a lot of skins where the programs tree area is white, a skinned scrollbar isn't really needed,
but if you are making a dark type start menu .skin7 that has a dark programs tree area, a darker scrollbar matches better.
To make your own scrollbar, borrow the bitmaps and scrollbar section text from Ivo's .skin7 or user modded .skin7
Modify the bitmaps to your taste and include in your modded .skin7 file with the correct matching resource numbers in Resource Hacker
Scrollbars can have color masks and scrollbars can even be semi-transparent to the desktop(have not tested lately).
A number of skins might only have scrollbar arrows for 100% percent display size.
If your computer is set for high dpi(144) bigger arrow and gripper bitmap sizes can be made to turn on with text like this:
[HIGH_DPI]
Scrollbar_arrows=42
Scrollbar_gripper=43
As for the Open-Shell nightly build 4.4.147
Be aware Windows 10 2004 has taken security more seriously.
They have "Reputation-based protection" that when turned on will delete any program it thinks could be a security risk.
It will even delete any installation files of your drive as well. I have mine turned off as I still use a few old programs that are not well known.
If you are using the new chromium-based Edge browser to download the version 4.4.147 .exe
it will get blocked from downloading as it is seen as a possible security risk.
I had to download it with Firefox. Even then when I tried to install, the Windows Smart screen filter stopped it from running.
I had to go through the hurdles to force it to install.
I checked the download with Microsoft Defender and Malwarebytes-no virus
At some point Open-Shell will release an official version, which in theory won't be blocked.
If you are not interested Classic Shell version 4.3.1 still works ok for most users.