File Extension SAT File Format SAdT Music Composer Mod/ Song SAT stands for SAdT Music Composer Mod/ Song. 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 Google Music Search is here! Sort of. Spotify goes Social Apple to Start Streaming from iTunes?