File Extension TLF File Format Short Message Service file TLF stands for Short Message Service 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 Using Query returned values in Oracle Graphics 6i Delete messages and time log Is the time right for Microsoft Online Services?