:max_bytes(150000):strip_icc()/SaveAs-5bf5d5f746e0fb002600e0a2.jpg "Excel File Extensions: XLSX, XLSM, XLS, XLTX, and XLTM")
Excel File Extensions: XLSX, XLSM, XLS, XLTX, and XLTM
This workbook couldn't be opened because the file format may not be matching with the file extension" when opening a spreadsheet – FYI
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:max_bytes(150000):strip_icc()/xls-files-7927a3e17bcc4883a3e687d3cf16bcf7.png "XLS File (What It Is & How to Open One)")
XLS File (What It Is & How to Open One)
How to Change the Default File Extension from .Xlsx to .Xls on Microsoft Excel 2007
XLS File Extension
![FIXED] Excel Cannot Open the File Because the File Format or File Extension Is Not Valid](https://media.licdn.com/dms/image/D5612AQEdianeu8o9Nw/article-inline_image-shrink_1000_1488/0/1712816384469?e=1718236800&v=beta&t=gnsOFR4UAH_9Xb4mLrSI5Dq73DvizDJtcFdGFEatkA0 "FIXED] Excel Cannot Open the File Because the File Format or File Extension Is Not Valid")
FIXED] Excel Cannot Open the File Because the File Format or File Extension Is Not Valid
What is the file extension for Excel - javatpoint
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Extensions of Excel | Types of File Formats ( XLS, XLSX, XLSM, XLSB )
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What is the file extension for Excel - javatpoint
![Fixed] Errore “Excel non Può Aprire il File Perché il Formato del File o l'estensione del File non è Valida”](https://4ddig.tenorshare.com/images/win-data-recovery/how-to-fix-file-extension-is-not-valid.png?w=600&h=337 "Fixed] Errore “Excel non Può Aprire il File Perché il Formato del File o l'estensione del File non è Valida”")
Fixed] Errore “Excel non Può Aprire il File Perché il Formato del File o l'estensione del File non è Valida”
How to Change the Default File Extension from .Xlsx to .Xls on Microsoft Excel 2007
