DPP 4 software won't open old Raw Files

[oldsurfer]

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?

[jrhoffman75 · Accepted solution]

DPP4 only works with RAW files from certain cameras.

[oldsurfer]

Thanks, the images were shot on an old Canon EOS-1Ds Mark II