File Extension SR File Format Sun Raster Graphic SR stands for Sun Raster Graphic. 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 Difference between Netra Enterprise 2 and Netra 5 Blade servers Do Sun and Fujitsu provide more than 2 disks in one blade? who will buy TIBCO in the end.