.FWTB File Extension
What is an FWTB file?
Website document template bundle created and used by Freeway Pro, an OS X app that allows users to create websites without coding experience; stores one or more website templates, which are used for implementing a popular design multiple times; may include template group, copyright, and description information.
To create an FWTB file, select File then choose Save As Template.... You can share your template bundle with other Freeway Pro users and they can install your template bundle into Freeway Pro simply by double-clicking it.
NOTE: Freeway Pro may also use the .FWTEMPLATEB file for storing template bundles, but it is much less common.