There is only one file type that uses the .WBP extension:
Webshots Collection File
File used by Webshots Desktop Connect, an application that enables users to view, organize, and share pictures; contains a collection of .JPEG images stored in the Webshots proprietary format; used to organize multiple pictures in a single collection; same as a .WBC file but less common.
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: November 20, 2014