Have you tried WindowsKey-Tab? I prefer to add the 'Switch Windows' button on my Quick Access Toolbar.

If you want to use that dialog with the macro, you can assign a keyboard shortcut to a macro by going to File > Options > Customize Ribbon > Keyboard Shortcuts, scroll categories to the bottom to find Macros and then select it on the right and add your preferred keyboard shortcut.

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Andrew Lockton
Chrysalis Design, Melbourne Australia