Howdy. When someone saves the file, you can select "Tools" dropdown in upper right corner of dialog box. Choose "General options". In resulting dialog in upper left is an option to "Always create backup". Uncheck that box.
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Nope, wrong spot. You looked at Tools in the Excel menu.
Go to File > Save as > and in the resulting dialog box, then look for the Tools dropdown in the upper right corner of that dialog box.
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