AT&T Multimedia Software Solutions (Lucent) in Maitland Florida once
(1995) sold a DOS-based illustration software package called Rio. 
Here's a press release:
http://www.lucent.com/press/1195/951116.bla.html  The file format was
"SCN".  (Apparently there's another TrueImage SCeeN file that also
uses the SCN extension, but I believe that's a different format.)

I wish to take some old SCN files and convert them to a modern format,
preferably a vector format like eps or Adobe Illustrator.

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Clarification of Question by ghost_rider-ga on 12 Oct 2005 17:16 PDT

Nothing?  No one has any information on this?