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.
SNB is an eBook files extension. It is the file extension of Shanda Bambook, an eBook reader. Shanda Bambook is originated in China but it is now available in USA market. SNBcan store eBooks. This format is relatively new to EPUB and other eBook reader file extension format.