Batch convert CorelGallery .ccx files to .cmx?

Some years ago purchased CorelGallery 1,300,000. The vector clipart came in a .CCX format.

However, the Gallery browser no longer loads into my Service Packed Windows XP. Also XP and Vista cannot display .CCX thumbnails in their respective Explorers.

Today I discovered if I change the file type from .CCX to .CMX. the thumnail displays.

My challenge is how to covert about 500,000 files from one to the other en masse.

Any suggestions, please.

Noel G