Change the windows wallpaper using a .bat file
Disclaimer : This post is solely for educational purposes. Any outcome of misapplication is thus not my responsibility. The windows operating system uses a bitmap image for wallpapers. An image of another format chosen as a wallpaper is first converted to a bitmap image and copied to a specific location and named wallpaper1.bmp. For this tweak, we'll need a bitmap image (with a *.bmp extension). MSpaint and Irfanview are tools that can be used to create (or convert) such images.