An archiver package was also needed to be able to open and seal the mail bundles. The list of supported archiver packages was PKZIP/PKUNZIP 1.10/2.04g, ARJ 2.30/2.41a, LHARC 1.13c/LHa 2.13, PKPAK/PKUNPAK 3.61, ARC 6.02, ZOO 2.10, PAK 2.51, SQZ 1.08, RAR 1.5x, and UC2 2.00. Optionally, an extractor program that automatically coped with the different decompression programs could be used. The two supported ones were General Unpack Shell (GUS) 1.90 or later and PolyXarc 2.1a or later.
