Arc
Arc: create and extract files from DOS .ARC files
This package creates and extracts-from ARC archives. An ARC archive contains files which are compressed according to the most efficient of three algorithms. ARC archives are usually only used for compatibility with MS-DOS.
This port of Arc can be used as a plugin for WinZip.
Utility
http://gnuwin32.sourceforge.net/packages/arc.htm
pc archive utility
Arc is a general archive and file compression utility, used to maintain a compressed archive of files.
An archive is a single file that combines many files, reducing storage space and allowing multiple files to be handled as one.
Arc uses one of several compression methods for each file within the archive, based on whichever method yields the smallest result.
Archive merger