Raymo,
that is likely correct. What you should do is use the Adobe DNG Converter,
it is provided free and updated regularly as new camera models appear.
Convert your Canon raw files to DNG, then open the DNG files with your version of Photoshop.
Alternately, use the Canon Photo Pro or whatever it's called to do your raw conversion and output to tif.
Then you can open the tif files in PS and work on them.
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