Files created with CYGWIN have "NULL SID:(DENY)" windows ACL, inter alia

[Eliot Moss]

Yes, if you read the part in the user's guide about ACLs it explains that.
As I recall, it's a place to hang information that is otherwise hard to
represent in Windows, because of the differences between how the Windows
and Posix permissions systems work.  You'll also find that the ACLs are
not in the order that Windows likes.  Don't let Windows reorder them, or
you will break what Cygwin is trying to accomplish!  Even though the
order is not standard, the ACLs work ...

Eliot Moss

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