File Extension POW File Format Chord chart (PowerChords) POW stands for Chord chart (PowerChords). 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 Printable 6% retail sales tax chart by dollar amount Do I need a modem for wireless Internet? How many statutory charts can be linked to a primary operational chart?