I went back to open some older Raw Files from 6 years ago that had been precessed with DPP 3.? but the DPP software shows this icon with the image and won't open it. What's going on?
Yep, it's listed on the Manuals page for the Camera. I'm always headed straight to the software download page. I guess I thought that the manuals page was for the camera not the DPP software.