Resolving '????????' users and groups

[Wes Barris <wesb at wesbarris dot com>]

I'm trying to find a solution for my files being listed with '????????'
as the owner and group:

-rw-r--r-- 1 ???????? ????????  137894 2010-02-25 11:34 1536.gff

The following page partially addresses this:

http://www.cygwin.com/cygwin-ug-net/ntsec.html

It says that:

--------------------------
If another user (or a Windows group, treated as a user) is not present
in /etc/passwd, the uid of that user will have a special value of -1
(which would be shown by ls as 65535). The user name shown in this
case will be '????????'.
--------------------------

I would like to modify the /etc/passwd file so that it shows me
as the owner of these files instead of '????????'.  That page
shows how /etc/passwd is used to create a mapping between Windows
Security SIDs and Cygwin uids.

How do I find/list the Windows SIDs of these files so that I can
create the proper mapping in /etc/passwd?
--
Wes Barris
--------------------------------------------------------------------
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