listHiddenDocs Parameter
Applies to: SharePoint Foundation 2010
Data Type: Boolean string
true to list hidden documents in a Web site; otherwise, false. Note that hidden documents are files and folders whose URLs contain a path component that begins with an underscore (_)
Setting this parameter is equivalent to viewing hidden documents in Microsoft FrontPage: click Web Settings on the Tools menu, click Advanced, and select or clear the Show documents in hidden directories check box.