There is only one file type that uses the .WBD extension:
Webshots Picture File
Picture file used by Webshots Desktop Connect, a program used for sharing, organizing, and viewing pictures; contains a picture image stored in a proprietary format; used by Webshots to help users organize their pictures.
NOTE: Webshots Desktop Connect was formerly known as Webshots Desktop and was owned by AG Interactive before being acquired by Threefold Photos in 2012.
Updated: December 9, 2014