Question

what type of file can you select the desktop background ?

Answer 1

Desktop background is usually set by adding a wallpaper or an image.

There are some wallpapers and themes already available in operating systems (OS) so that users can choose their favorite to apply in the background.

You can also create attractive images or designs in Paint application of your desktop and add them to the library of wallpapers.

Answer 2

Windows allow many types of digital images for desktop backgrounds. some famous file formats are as followed. BMP, JPEG, PNG, TIF, JPG, GIF and many more.