Its description on the site read:
I finally got round to working out to write programs in direct-x, and here is my first effort! A rather nice fireworks screensaver. Click on the link below to download it, then just extract the zip file, and place the .scr file in your windows directory to add it to your screensaver list.
I've got lots of programs I want to write in direct-x, I'd really like to convert my 3d-engine etc... But I'm a bit busy at the moment, writing java applets for another web-page, and with my course.