What is the default file extension for a standard Microsoft Excel 2019 workbook?

A. .xls

B. .xlsx

C. .excel

D. .xlsm

Explanation

A standard Excel workbook uses the .xlsx extension. Macro-enabled workbooks use .xlsm, while the older Excel 97–2003 binary workbook format uses .xls.

Source

Microsoft Support — File formats that are supported in Excel

Answer verified on 2026-09-21

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