You see, throughout the 80's, 90's and all the way up to mid 2000's, anybody using any Mac OS version prior to Mac OS X was using.
sit is a proprietary archive format from the 90's which allowed Mac users to confidently 'stuff' their files, applications and documents into a flat file that could then be copied to a non-Mac hard drive partition, namely a DOS (FAT32) or Windows (NTFS) partition, without any risk of DATA corruption. sit file is a Stuffit archive, much like ZIP files today, except that.
