How to suppress the file corrupt warning at Excel download?

If you don’t want to look for a solution, but just want to solve the problem, insert this key in your registry to suppress the notification:

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security]
“ExtensionHardening”=dword:00000000

You can accomplish the above by doing the following:

  1. Open your Registry (Start -> Run -> regedit.exe)
  2. Navigate to HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\OFFICE\12.0\EXCEL\SECURITY
  3. Right click in the right window and choose New -> DWORD
  4. Type “ExtensionHardening” as the name (without the quotes)
  5. Verify that the data has the value “0″

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