File Extension XFM File Format Cooledit 1.50 file XFM stands for Cooledit 1.50 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 Writing to a file with a data array Single "Filler" Field Flat File vs Multiple Fields Defined Flat File Why can't create a physical file has more than one record format ?