![]() "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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