OK, Gepard was so nice to inform me that there was a little prob with a file in the CAS03 pack for the French CAS plane: one of the .spr files was saved as .txt file (so actually not as .spr).
I changed that now, and put up a new, corrected zip. The download link in the first post should lead you to that fixed file now, so if someone has uploaded before I would advise you to upload the French CAS again. Of course you can also changing the .txt file yourself if you want, simply by loading it into a text editor and saving it with the correct file extension again.....