Ultramailer v3.5 key1/11/2024 Open Microsoft Excel and go to "File" > click Export and choose Change File Type. 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. Verify that the file has not been corrupted and that the file extension matches the format of the file." "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid. It usually indicates the file is not compatible with the Excel version of the file that has come corrupt or damaged. Here, we will show you all the possible solutions, and you can try these until your issue is fixed. Mestrenova unknown format of file troubleshoot professional#īefore you follow the solutions, check if Excel is working normally. ![]()
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