File Extension DA_ File Format GKSetup support file DA_ stands for GKSetup support file. 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 MS Diagnostics and Recovery Toolset (DaRT) 10 Microsoft Rolls Out DaRT 8 Beta Overlay and 'print' as pdf. Overlay not included !