Step 4: When you return to the Permissions dialog, you will see that the Everyone group has been added to the group or user list. When the next dialog opens, click Find Now, select Everyone from the search results list, and then click OK. Step 3: When the Select Users or Groups dialog opens, click Advanced. When the Permissions dialog opens, click the Add button. Step 2: When the file's Properties dialog opens, select the Security tab and click Edit. Step 1: Right click the Excel file that cannot be opened, and then select Properties from the context menu. In this case, changing the file permission will solve this problem. The reason for the error "Excel cannot open the file because the file format or file extension is not valid" may also be that you do not have permission to open the Excel file. If you're sure that the file extension is not the problem, read on. Then check if you can open this Excel file successfully. Then check the file extension of the Excel file. Select the View tab and make sure the ‘File name extensions' check box is checked. Open File Explorer in your Windows 10 and navigate to the Excel file that cannot be opened.Ģ. So, it is advised to check the file extension first while dealing with this error.ġ. 5 ways to fix "Excel cannot open the file"Ī mismatch between the file extension and your current Excel version may cause the error "Excel cannot open the file because the file format of file extension is not valid". This page shows you several common and effective solutions to fix the " Excel cannot open the file because the extension is not valid" error and ensure that you can open the problematic Excel file without losing data. You tried to open an Excel file in Windows 10 but found that it couldn't be opened and reported the above error message? There are many reasons for this problem, such as file extension incompatibility with Excel version, file format corruption and so on. Verify that the file has not been corrupted and that the file extension matches the format of the file. Fix: Excel Cannot Open the File Because the File Format or File Extension Is Not ValidĮxcel cannot open the file 'filename.xlsx' because the file format or file extension is not valid.
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