File Extension SR File Format Sun Rasterfile : Bitmap graphics SR stands for Sun Rasterfile : Bitmap graphics. 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 Loading signature into a PictureBox control Difference between Netra Enterprise 2 and Netra 5 Blade servers Do Sun and Fujitsu provide more than 2 disks in one blade?