It's a limitation purely for windows. On other OSes calibre does not enforce this restriction. And this restriction is still present on windows despite the registry key because the registry key is a god awful hack. With it enabled random windows software will be unable to see the files, including windows explorer. And you can destroy your library copying it from one computer to another if the state of the registry key is different on the two computers. I prefer to be conservative with data integrity. If someday Microsoft manages to lift this restriction for real, I might reconsider. That day hasnt arrived yet.
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