The summary.c file in the root of the mswordview dist is a port of the Somar 
Software freeware DLL functions to get summary info from OLE 2.0 document 
files, named CPPSUM available from the Somar Software WWW site at 
http://www.somar.com

The port (as always) is written by Caolan.McNamara@ul.ie and is released
under the LGPL

An example of usage of the summary stream is shown in wvSummary.c