 For LOGO.SYS or the equivalent embedded image in IO.SYS, Windows will also animate the image's color information using palette rotation; the image is static, but may have the illusion of movement as colors are changed.As the files are standard RLE-compressed .BMPs (with an entirely optional custom tag segment) renamed to ".SYS", they may be opened and edited using image editing tools such as MS Paint, and the contents replaced with user-selected pictures; the only conversion needed is to change the file extension, and to ensure they are in the correct resolution and color depth (with dithering if needed).However, the process is not foolproof