How can we map UNIX "nobody"/"nogroup" to Win32 SIDs/accounts? Cygwin has entries for "nobody" in /etc/passwd and "nogroup" in /etc/group, but these accounts have SIDs returned by /usr/bin/getent passwd and /usr/bin/getent group which LookupAccountSidA() does not recognise.
So what is the correct Win32 solution, without relying on Cygwin?