This article has covered some of the most effective workarounds to resolve the error. Also, the error may occur if the Excel file has turned corrupt. You may encounter the error ‘Excel cannot open the file because the extension is not valid’ when opening a workbook with a different file format or an incorrect file extension. To learn how the software works, read this: How to repair corrupt Excel file using Stellar Repair for Excel? Also, it helps recover all the file components, including tables, pivot tables, cell comments, charts, chart sheets, images, formulas, etc., without impacting the original structure of the Excel file. Stellar Repair for Excel software can help repair severely corrupted XLS and XLSX files. In the file properties dialog box, click the Security tab and then hit the Edit button.Right-click on the file that won’t open and click Properties.Follow these steps to change the file permissions and see if it fixes the problem: Usually this happens when you try to open an Excel file received from some other user. You may receive the ‘Excel file format or file extension is not valid’ error if you lack sufficient permissions to open the file. Workaround 2 – Edit the Excel File Permissions Select a file format (i.e., the one supported by your Excel version).Ĭheck if you can open your Excel file. In ‘Excel Options’ window, under Save workbooks section, click on the Save files in this file format: drop-down. ![]() ![]() Note: For Excel 2007 and earlier versions, click on the Office button.
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