LHA LhA is an archiver for the Amiga, supporting both the -lh1- (LZH) and -lh5- (LHA) compression formats. Since its inception in late 1991, LhA has been the fastest archiver for -lh1- and -lh5- files, although it was supplanted by LX in 1993 for the fastest decompression of these files. Author: Stefan Boberg