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What is the default file extension for Microsoft Excel 2007 and later?

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What is the default file extension for Microsoft Excel 2007 and later? Answer: .xlsx

Beginning with Excel 2007, Microsoft introduced the XML-based default format .xlsx.

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This question is part of 📁 Microsoft Office within the broader 💾 Computer Science subject and appears in the CTS – Candidate Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.