The files have been renamed to have a .bmp extension. That way you can work with them best if you're unsure you want to use them.
To use them rename them to have a .sys extension. If you don't know how to do it look furhter down the page.
After you download the file, unzip it (using WinZip or a similar product). The files will be simple, everyday windows bitmaps, with a .bmp extension. If you want to use them procede like this:
If you found you couldn't follow the instructions, get a more user friendly computer, pay more to get better, buy an Apple computer.