Are you thinking of something like WinFS? https://en.wikipedia.org/wiki/WinFS https://en.wikipedia.org/wiki/WinFS Or more like Beos BFS with its extended attr

Are you thinking of something like WinFS? https://en.wikipedia.org/wiki/WinFS https://en.wikipedia.org/wiki/WinFS Or more like Beos BFS with its extended attributes, indexing and querying? https://en.wikipedia.org/wiki/Be_File_System https://en.wikipedia.org/wiki/Be_File_System Also I think a lot of the old mainframe filesystems had the concept of records and indexes built in since they were primarily used for business operations.