MMNotes.getSiteRootForFile()

Description	Determines the site root for the specified Design Notes file.
Arguments	fileURL
	The argument is the path to a local file, expressed as a file:// URL.
Returns	A string containing the path of the Local Root Folder for the site, expressed as a file:// URL, or an empty string if Dreamweaver is not installed or the Design Notes file is outside of any site.