File Extension CMT File Format Corel Draw CMT stands for Corel Draw. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question How to open a CDR file Unable to open Corel Draw image HOW DO I GET RID OF COREL?