File Extension BML File Format Binary markup language BML stands for Binary markup language. 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 change language from Spanish to English Applying packet switching and binary systems to user accounts What is the logical AND of binary strings?