Digital BW, The Print

Slightly off the subject, but I'm trying to open some early scans that a lab
did - PCD  (Kodak Photo CD's). I used to know a way of opening them,
but forgot, and would like to print a set of B&W desert landscapes with I
had archived on them. 

Does anyone remember how one can open them in photoshop (or some other way)?
When I click on the file a message shows up saying: 

 "Could Not complete your request,
because Photoshop does not recognize this type of file"

Any help would be appreciated, and thanks.

Clayton Price

clay@...