There is only one file type that uses the .WWD extension:
Works Wizard File
Wizard that guides the user through a series of steps to create a customized Works document; may be a text document, flyer, spreadsheet, calendar, or other type of file.
In Microsoft Works 9, the wizard files are stored in the "\Setup\MSWorks\PFiles\MSWorks\1033\Wizards\" directory within the Microsoft Works 9 folder.
Updated: November 17, 2008