chgrp in Windows

[lemkemch@t-online.de]

I've got what I feel is actually a terribly basic Windows question.  If I set a gid with e.g. chgrp where does Windows store that information on a local NTFS file system?  The result of chown I can see in Windows Explorer as the Owner but where is the group information?  Or put another way: how to do a chgrp with Windows means?  Note I am not asking about any uid/gid SID mapping.

Thanks,
Michael

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