.sit?

whats a .sit file

Thanks

Its a stuffit file - a compressed file that is and was popular on the mac but is increasingly being superseded by zip.

If you have such a file it can be uncompressed using the free stuffit expander
http://www.stuffit.com/mac/expander/index.html

well its a demo called Jedi Knight Academy, but it gives me this error code

what error code

Oh its working fine now, it might have been stopped in the middle during when I was expanding it.