How can I convert images with a .KDC extension to .JPG?

In the mid 1990's I purchased my 1st digital camera a kodak DC120 after trying out many.  

At that time Kodak had its own system and the images had a .KDC extension.   I gave the camera away along with the software and have over the years upgraded my computer many time.   Now I find that I am unable to open these old images with .KDC extensions.   These images are in the 10's of thousands and to lose them would be a real tragedy for me.   They have no historical value except to the family.

I do not want to loose these old images, but at this time, I have no way to open and batch convert them to a more current file extension like .JPG

I have purchased several softwares in attempt to find the solution to my problem, including contacting Kodak.   To date, I have had no success in my quest.

Does anybody still have the software disk which came with the DC120 Camera, or know of a solution to my problem?