Holds temporary files used internally by file transport programs.
The /var/spool/uucp/.Workspace directory holds temporary files of various kinds used internally by BNU file transport programs.
This directory is part of the Basic Networking Utilities Program (BNU) in BOS Extensions 1.
The uucico daemon, uuxqt daemon.
Understanding the BNU File and Directory Structure in AIX 5L Version 5.1 System Management Guide: Communications and Networks.