[issue7443] test.support.unlink issue on Windows platform

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

As I can see cygwin's unlink_nt uses Nt* functions family (NtSetInformationFile etc) which are part of Windows DDK.

Do you like to use them or prefer SDK ones (say SetFileInformationByHandle)?

In second case python unlink can borrow deletion schema from cygwin for modern Windows versions (Vista+) and return to legacy trivial DeleteFile call if OS is WinXP.

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