How do I open an .sd image file

I do support for a dental office and they recently asked me for help accessing their old files. They have dozens of CDs full of these image files.

No one seems to know what program created them - it's a bunch of older completely computer illiterate people).

The only clues I can find when opening the files in a text editor are: The first line says: Dentofacial Document 2.0 A bit further down it says: Dentofacial Picture Format 2.0

I have tried the usual suspects like opening it in Paint, photoshop, illustrator, Acrobat, gimp, zip and iso programs. Anyone have any experience or suggestions? Or can maybe tell me the manufacturer of the software so I can contact them.

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