WinFS?
What is the point of a having a Database as the OS's filing system.
Databases are for related information. The OS's FS just stores files of various types and names. The XP Search function along with indexing is sufficient.
Unless you are going to allow end users to tag their files (e.g. photos) with custom tags (e.g. London, Business Trip, Taken By: ...) then I don't see the point.