Responsive screensaver for windows (.scr)?

Question

Windows

Good evening.
The task is to make a screen saver in the .scr format
Through what to do, if with pens, then where to read the info on the code.
Responsive for all screens

Answer 1

.scr = .exe
Write a program that runs in full screen. If you use vector graphics, it will be under "all screens".

Answer 2

I use IrfanView.
It has many options for working with images, including the ability to create .scr screensavers. You can also create a screensaver
through it that will scale to different screens
. The license is free for non-commercial use.