So.. I downloaded these things and one is an .sit and the other is a .bin.
Now these are suppose to be demos I'm guessing some program I'm suppose to have to open these? what program

.sit is for MacOS systems, but supposedly you can unpack it with this tool. http://www.stuffit.com/win/index.html

.bin is also a MacOS extension and I believe the same tool listed above will open it.

Hope that helps!

.bin is also a PC extension used when hacking CDs and distrubiting them over message boards where they have file size limits.

.bin is just a cd (or dvd) image file. You can mount it with Daemon Tools, for example.

How do you use it?

If you mean Daemon Tools - here's a short FAQ.

There's nothing for a .bit

.Bin's come with a .CUE they have to be in the same folder.