File Extension GEF File Format Graphics Exchange Format GEF stands for Graphics Exchange Format. 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 does EPS differ from other graphic formats? What is the difference between NVIDIA Graphics and Integrated Graphics? How are the graphics and images stored when you save a worksheet as a web page in Excel?