Excel File Extension Archives

Excel File Extension

How to Check Excel File Extension (2 Easy Methods)

Tasmia Rahim February 24, 2026

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Knowing your Excel file’s extension is important for compatibility, sharing, and choosing the right features. For example, modern Excel uses .xlsx, while older versions use .xls. Other formats, such ...

Excel Pro Tips

[Fixed] Cannot Open the File Because the Extension Is Not Valid

Shihab Shahriar February 1, 2026

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Sometimes when you double-click an Excel file, you get the message: "Excel cannot open the file because the extension is not valid." This issue is common among users who receive files from email, ...