UNSIT is a simple utility for PC users to extract files from a StuffIt file. StuffIt files usually appear with the “.SIT” extension. StuffIt is a program for Macs similar to ARC for PCs. It collects several files in a single file and also compresses the data using run length, Huffman, or LZW compression. Unfortunately, this means Mac files are frequently inaccessible to PC users as they are now “stuffed” to save transmission costs and disk space.

ftp://garbo.uwasa.fi/pc/arcers/unsit30.zip