File Extension FW File Format Database (Framework II) FW stands for Database (Framework II). 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 VS.NET SETUP project for .NET Framework 1.0 SECURE FTP SITE ON Windows 2003 What's the best way to create flat file database structures?