A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
The whole secret is to read the article you mention EXACTLY:
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To automatically open a specific workbook when you start Excel, you can place that workbook in the XLStart folder, or you can use an alternate startup folder in addition to the XLStart folder.
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It says "workbook" not "template":
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To use a worksheet template, create a workbook that contains one worksheet. On the worksheet, include the formatting, styles, text, and other information that you want to appear on all new worksheets that will be based on the worksheet template.
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Andreas.