'-Y' - COMPRESS ARCHIVES

This option forces LZX to compress files which are known by their extension
to already be compressed.  By default, LZX will simply store these files
without attempting to compress them, the reason being that attempting to
compress one of these types of files yields very little (invariably 0-3%)
in the way of additional compression.

The following file extensions are treated as indicating an archive:

AIN ARC ARJ DMS GIF HAP JPG LHA LHW LZH LZX PAK PP RAR UC2 WRP ZAP ZIP ZOO

Additional file extensions will be added as more archive types become
available.


VALIDITY

This option is valid with the following commands:

   a (add)
   u (update)