File Extension BSB File Format BioShock saved game BSB stands for BioShock saved game. 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 Kindle games & apps what "permissions" are dangerous? Bungie.net and Bungeelabs.com sound like fun sites to keep an eye on Can Android phone multitask?