I do not know, whether this can be helpfull, but according to msdn: Multiple Data Streams NTFS supports multiple data streams, in which the stream name identifies a new data attribute on the file. Each data stream is an alternate set of file attributes. Streams have separate opportunistic locks, file locks, allocation sizes, and file sizes, but files can be shared. Maybe it is possible to define such stream as password-stream associated with given file system object :confused: Mukkie