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My Cygwin installation is behaving strangely: chmod does not work.

[09:45 Administrator@DellIns14 ~] > ls -ls /usr/bin/chmod
64K -rwxr-xr-x 1 Administrator None 38K Feb  6  2012 /usr/bin/chmod

[09:47 Administrator@DellIns14 ~] > rm /tmp/example.sh
rm: remove regular empty file `/tmp/example.sh'? y
[09:48 Administrator@DellIns14 ~] > touch /tmp/example.sh
[09:48 Administrator@DellIns14 ~] > ls -ls /tmp/example.sh
0 -rw-r--r-- 1 Administrator None 0 Jul  8 09:48 /tmp/example.sh
[09:48 Administrator@DellIns14 ~] > chmod -v +x /tmp/example.sh
mode of `/tmp/example.sh' changed from 0644 (rw-r--r--) to 0755 (rwxr-xr-x)
[09:48 Administrator@DellIns14 ~] > ls -ls /tmp/example.sh
0 -rw-r--r-- 1 Administrator None 0 Jul  8 09:48 /tmp/example.sh
[09:48 Administrator@DellIns14 ~] >

Note that the directory is writable, as the file is created.

When I look at this directory from a windows perspective, it is reported as read-only (even after I change it to read-write, it reverts to read-only).
Screen-captures are at cygwin's /tmp is read-only in windows, and cannot be changed to read-write

Can you suggest how to debug/solve?


Environment:
Windows 7, Cygwin 1.7.29(0.272/5/3) i686

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