OK, do you want to know the really weird bit? I managed to acquire a copy of Corel Photo House (v 1.00.172 in italian of all things), and it refuses to open the file. The program doesn't even appear to have a .CPS file option in the save or load dialogs. Are you completely sure this program is what created the file in the first place?

pca
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Experience is what you get just after it would have helped...