File Extension STS File Format Song file (Music) (Scream Tracker) STS stands for Song file (Music) (Scream Tracker). 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 Add songs to MP3 SanDisk clipsport Launching and operation of a music website Should I use a website for downloading music?