Hi Nelson. This problem is normally caused because the file being saved does not get saved properly. There is a kesrepair utility in the diags folder you can use to try to recover the file. Put it and the file into a folder and see if the pages can be recovered. 
Another idea, for future use, is to tell your antivirus program not to monitor the Kurz well educational systems folder under my documents.
Hope this helps.


Sent from my iPhone

On Nov 3, 2012, at 11:07 PM, Nelson Blachman <[log in to unmask]> wrote:

>  Yesterday I pasted a set of 18 new pages at the end of a Kurzweil 1000
> file after using control+Enter to start a new page.
> 
>  This procedure had always worked all right, but this time K1000 responded
> to my trying to open it with 
> "An error occurred when opening the file; its format could not be
> determined."
> 
>  I'll be grateful for any suggestion as to how to rescue this file, which
> I've been 
> lengthening each month by 18 pages for the past three years.
> 
>  Nelson
> 
> 
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