MacGzip is Jean-loup Gailly's gzip compressor (GNU zip) for the Macintosh, ported to Mac by SPDsoft. Gzip is not an archiver, but a compressor. A compressor makes a compressed file for every plain file; an archiver will make a single compressed file from a set of files/directories. Maybe some day I will try to port GNU tar (the natural archiver to be used with gzip) to Macintosh, but don't rely on this