I've been primarily making exposures on my 20D using the L fine or S fine jpeg format. I recently starting taking photos in RAW+L jpeg format. When using Adobe PS CS, the program will not allow me to open up the RAW CR2 files. A message pops up saying that I cannot open up the files because they are the "wrong type". Prior to attempting to process RAW files, my post-processing has been limited to adjusting basic levels with jpeg files. What am I missing here?

