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how to recover a corrupted notebook?

• To: mathgroup at smc.vnet.net
• Subject: [mg114234] how to recover a corrupted notebook?
• From: "Nasser M. Abbasi" <nma at 12000.org>
• Date: Sun, 28 Nov 2010 06:53:20 -0500 (EST)
• Reply-to: nma at 12000.org

Hello,

Mathematica 7.0,

As sometimes happens, Mathematica went into some loop,
waited and waited, and after 5 cups of coffee, could not
wait more, so I shutdown the process.

Now my notebook will not open, it says it is corrupted.

I tried to fix it using a text editor, but could not.

Here is the original corrupted file, in this folder:

http://12000.org/tmp/nov_27_10/

I was wondering if there is a tool which will help in
this? May be some automated tool which can fix a corrupted
notebook?

I do make sure I save my notebook all the time, but it looks
like Mathematica does not make a backup copy of the notebook,
so I am stuck. This means I will have lost about 5 hrs of
work if I can't recover this.

Why does Mathematica not automatically make a side backup
copy of the notebook all the time? Like say MS Word does?

thanks for any ideas and help.

--Nasser