LZ LZ is an archiver for the Amiga, supporting both the -lh1- (LZH) and -lh5- (LHA) compression formats. It was the first program for the Amiga to support the -lh5- format. When it was first released in early 1990, LZ was far faster and more compressive than its competition, Lharc and LharcA, and retained this position throughout its development history, until the end of 1991. Author: Jonathan Forbes