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Never done it, so I don't know if you want to trust the site and download a .exe file without scanning it first...

But google provided me this link: http://anthonylarme.tripod.com/phantas/phvmd.html

That is for VMD, which I believe that the Sierra Resource Viewer can open, but not DUC files. SEQ sequence files can definitely be handled by the Resource Viewer.

http://sciwiki.sierrahelp.com/index.php ... rce_Viewer

or

http://www.sierrahelp.com/forums/viewto ... 4994#p4994