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.
PS (post script) is file format that can be both vector image and document file. It can contain vector images and text at the same time. PS file holds an instruction about how to print. As it supports both text and images so it can instruct printers how to print the file. PS files are later improved as PDF format.