Query for the very old: .SDN archive

["Rob, grandpa of Ryan, Trevor, Devon & Hannah" <rmslade () shaw ca>]

In doing some old research I have come across a file with an SDN extension.  The 
filename indicates that it is a copy of an old virus scanner.  The internal file 
structure seems to be consistent with an archive of that scanner from that era.  (It 
doesn't start with a PK, so it's not a zip archive.)

Anybody remember what this was?  Anybody know what would open it?

======================  (quote inserted randomly by Pegasus Mailer)
rslade () vcn bc ca     slade () victoria tc ca     rslade () computercrime org
Vizzini: You fell victim to one of the classic blunders! The most
         famous is never get involved in a land war in Asia
                                                - The Princess Bride
victoria.tc.ca/techrev/rms.htm http://www.infosecbc.org/links
http://blogs.securiteam.com/index.php/archives/author/p1/
http://twitter.com/rslade
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