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Excel - Prevent File Format Difference

The following steps will stop Excel throwing a warning about "file you are trying to open is in a different format".

Details are taken from a Microsoft article at the following URL

https://blogs.msdn.microsoft.com/vsofficedeveloper/2008/03/11/excel-2007-extension-warning-on-opening-excel-workbook-from-a-web-site-2/

  1. Click "Start" and in the search/command box enter 'regedit' and click "OK"
  2. Locate and click the following key in the registry
    • Outlook 2000 - HKEY_CURRENT_USER\Software\Microsoft\Office\<version number>\Excel\Security
  3. On the "Edit" menu select "New|DWORD"
  4. Give this a name of "ExtensionHardening" and then 'Enter'
  5. Modify this entry and enter a value of "0".
  6. Click "OK" and close regedit to complete
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