File Types in Excel: When to use XLSX, XLSM, XLSB, XLS etc.?
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Extensions of Excel | Types of File Formats ( XLS, XLSX, XLSM, XLSB )
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Excel File Extensions: XLSX, XLSM, XLS, XLTX, and XLTM
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Extensions of Excel File – File Formats Supported in Excel - Earn & Excel