This format is used for data exchange in programs that work with vector graphics from Corel, and also for printing completed designs. It contains image data and also the metadata that describes it. In CMX it’s possible to store layers that can be independently edited. The format is recognized by Adobe Illustrator versions 6-8.
The PCD file type is primarily associated with Photo-CD by Kodak. Kodak Photo-CD multiresolution Image. Note: This file type can become infected and should be carefully scanned if someone sends you a file with this extension. The script inside the file is what is attacked.