How to open a .sit fileA .sit file is an archive file created using a software called Stufit on the Mac. It is rare to come across .sit files these days but they exists and you need Stufit to open them. Stufit Deluxe is not free, but the Stufit Exander is free. To open .sit files download Stufit Expander.I wonder if people still use Stufit and .sit files these days. If there are people who do, please use .tar.gz, .rar, or .zip instead.