.uss file format

Hey all, just wanted to ask a quick question about a file format. I downloaded a screensaver called Space wars where a bunch of ships fly around and shoot each other randomly. Its fun to watch, and I enjoy it. Its also in realtime 3d, meaning the files for the ships are saved to my library, and the file format is “.uss” I tried searching for what file format this is, but all i got were a bunch of links to 3d repository sites about how many Stark Trek ships they had. I hope someone knows what this is, as i want to see if I can convert them to a different file format and then maybe upload them into blender.