Reader Question: Why isn't my Excel 2016 default workbook loading?

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Poster CWBillow asks:

I have a workbook, book.xltx in the folder C:UsersCWBillowAppDataRoamingMicrosoftExcel XLSTART.

If I go there and right-click and open it, all looks fine. But if I just start Excel, the template isn't being used. What am I doing wrong here?

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