![]() "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid. Sometimes, when you try to open or edit an Excel file in Microsoft Office 2003, 2007, 2010, 2013, 2016, 2019, or 365, you may encounter the following problem: Full stepsĮrror "Excel Cannot Open the File Because The File Format or File Extinction Is Not Valid" Start Office Excel > click File and Open > select the inaccessible Excel file. Open Microsoft Excel and go to "File" > click Export and choose Change File Type. ![]() Launch EaseUS Data Recovery Wizard, and then scan the corrupted or damaged Excel files.
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