CPD graphics format comes from earlier Corel tool called PrintOffice, but this has been discontinued or integrated in CorelDRAW years ago.
Still, some users might own .cpd files and wonder how to get these pictures or drawings to modern format, or at least something that can be opened in modern software.
We have not found any particular mentions about cpd to png conversion, but some sources indicate that CorelDRAW might still be able to import or open old .cpd files. If that is no longer case, then contacting Corel support for help is probably the only remaining option.