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When you are saving a workbook in versions of Excel up to 2003, it will automatically assign that as the extension. If you specifically want it in versions 2007 or 2010, which normally use xlsx, then you need to use the Save As option. Dong so may possibly lose you some features of your spreadsheet as you will be saving it in an older version. So that is something you need to be aware of, though for most standard ones it will not have any major effect.

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