What should I do if the prompt when creating a new worksheet in xls format does not match the extension?

What should I do if the prompt for creating a new xls format worksheet does not match the extension?

The solution is as follows:

1. Press the [win r] shortcut key to open run, enter regedit, and press Enter to open the registry editor;

2. Find the registry subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security

3. Click the mouse in the blank space on the right Right-click, select "New-> DWORD Value (D)", enter "ExtensionHardening", click OK

4. Right-click ExtensionHardening, and then click "Modify (M )", just fill in "0" in the numerical data.

At this point, there will be no problem when we open the excel worksheet again.

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