I haven't actually done this, but I did look into it a little. There's an add on for blender that some guy made that will supposedly allow you to import cerec files. I guess you would then be able to save them in a different format. I spent about 5 minutes trying to set it up at home before I got distracted by something else. I'll get back around to it eventually.
I thought you could convert anything with that fancy program of yours. water into wine, lead into gold...