Here are a few quick notes on how to use PKZIP, ARJ, or LHA to
decompress files.

For PKZIP use
PKUNZIP -d [archive file]
EXAMPLE: PKUNZIP -d EXAMPLE.ZIP
Make sure you always use the -d switch.  It doesn't hurt the
decompression if the archive doesn't have subdirectories, but it is
essential if the archive does.

For ARJ use
ARJ x [archive file]
EXAMPLE: ARJ x EXAMPLE.ARJ

FOR LHA use
LHA x [archive file]
EXAMPLE: LHA x EXAMPLE.LZH