How to set classic background color in Windows 10?

• Right click on desktop and select "Personalize" menu
• Set "Background" option to "Solid color"
• Click on "+ custom color" button
• Click on "More"
• Check that "RGB" is set
• Enter "#336EA5" and click "Done" button

That's all.

Delphi case

Delphi supports interfaces natively. Any variable of variant type can store an interface like any allowed data types.

Here is the check list of Windows 10 services that may be deactivated to free some memory and other resources.

• 'Connected User Experiences and Telemetry' service (previously 'Diagnostics Tracking Service' in Windows 7/8/2012). Unfortunately, it is not sufficient, you should also go to Task Sheduler and disable all tasks in the folder \Microsoft\Windows\Application Experience. Also check that they are still disabled after any Windows update

To be continued...

An annoying problem due to invalid download links in the package. The Debian package was fixed already.

Solution for Ubuntu.

1. Download ttf-mscorefonts-installer_3.6_all.deb package from Debian site into your Downloads folder