[h-e-w] file ownership in NTemacs

[Richard M. Heiberger]

Windows XP Home edition has a concept of file ownership that
parts of NTemacs understand and other parts don't.  These are
my observations along with a request for someone who understands
the underlying Windows to fix the behavior I see.

There are three accounts on my machine: Administrator, Owner, rmh.
The machine came with the Owner account and I copied many files to the
machine in that account before I created my own rmh account.

I can gunzip gzipped files belonging to Owner from dired by entering
    X gunzip -N
(The more obvious Z isn't working, I don't know why.  Z does gzip files.)
Then when I open them into emacs, they come up empty with a warning that
the file exists but can't be read.

I discovered that I can use M 777 from dired to change the mode, and then
the file can be read.  The obvious O command to change the owner is not
supported on NTemacs.  The corresponding chown is supported by cygwin.

dired shows owner and group
  -rw-rw-rw-   1 rmh      root    32851 Mar 23  1999 cdrom
find-dired shows
  -rwx------+   1 Owner    mkpasswd    32851 Mar 23  1999 cdrom

system files are shown by dired
  -rw-rw-rw-   1 rmh      root      799 Aug 18  2001 prtwebvw.css
and by find-dired
  -rwxrwx---+   1 Administ SYSTEM        799 Aug 18  2001 prtwebvw.css


I am currently using
GNU Emacs 21.2.95.1 (i386-msvc-nt5.1.2600) of 2003-01-30 on buffy


Here are my requests

1. I would like dired to show the owner and group that Windows XT understands,
which I believe is the same as shown by find-dired.

2. I would like O to work to change the owner.  I suppose it should
honor the account type.  I have set myself as an administrator on this machine
so I expect it to work for me.  cygwin chown works from the *shell* buffer.

3. Since find-dired displays several different groups, I assume there
is a concept of group on Windows XT.  I don't know how it corresponds
to what Windows thinks.  I would like G to change groups in dired.
cygwin chgrp works from the *shell* buffer.

4. Since there is a concept of owner and group, and since find-dired
displays three distinct sets of permissions, I would like dired to
also display the three distinct sets of permissions.

5. In dired-aux.el change dired-do-chown and dired-do-chgrp to
recognize when cygwin is installed and redefine dired-chown-program
and define a new dired-chgrp-program to use the cygwin functions.


Thank you
Rich