File format and extension do not match. File may be corrupted

1. Win key R key, open "Run", enter regedit to open the "Registry Editor"

2. Find HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\ 15.0\Excel\Security, select "Security"

#3. On the right, right-click the mouse and create a new - DWORD (32-bit) value - change the name to "ExtensionHardening" - Change the value to 0

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