In Windows 10, when viewing
an image with explorer you can right mouse click on it and then select
set as background to make an image your desktop background or wallpaper.
Set your desktop background
color to black - right mouse click on an open area in your desktop, select
properties and then desktop. Copy the images you want for your screen saver
or wallpaper to a directory on your disk drive from the uvminerals/images
directory. Then configure the screen saver or automatic wallpaper changer
to use the new images.