Features Built on Reparse Points
A reparse point is a file or a directory that has user-controlled data stored in the system-administered reparse attribute. The reparse attribute is used by file system filters to enhance the normal behavior of files or directories present in the underlying file system. Thus, a file or a directory that contains a reparse point acquires additional behavior not present in the underlying file system.
For more information about sparse files, see the Platform Software Development Kit (SDK) link on the Web Resources page at http://windows.microsoft.com/windows2000/reskit/webresources .