File Extension CSW File Format Windows Corel file CSW stands for Windows Corel file. 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 HOW DO I GET RID OF COREL? Do Windows antivirus tools use API Hooking to protect files?