Attached Link: http://www.tucows.com/

This may sound sarcastic, but you don't Unzip a Sit file. You unzip zipped files with Winzip and other zip programs. Sit files are a Macintosh file compression format. I guess you can still use the contents, but you need another program to handle the sit files. I am posting a link for one of the major download sites. You will be able to find a program to handle sits easily there. I think you can try Aladdin Expander. As for me, I don't Sit Still for sits. If I download them by accident, I delete them.