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Probably because it was a dumb idea.

There's no sense storing videos, baby photos and "quarterly report new (2) backup newest 08.2019_john.xlsx" in a database.

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If the filesystem itself was modeled after a database (which it can be argued it is, somewhat), it's not much of a stretch for WinFS to have been a thing.

I was looking forward to seeing it in action based on reports of what it was.

File systems are databases in a small way. They use b-trees and such, but they don't enforce a rigorous global type system, don't enforce a table structure because everything has to have a schema, don't have the overhead of a query language to interpret every file access command, didn't ensure that all file accesses be ACID compliant, etc.

WinFS imposed all of those things and the associated overheads and much, much more every time you accessed anything.

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