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. In Excel 2010 and newer versions, click on the File menu.Note: Take a backup of the Excel file that you cannot open and try the steps on the backup copy. To fix the error, try changing the Excel default file format by following these steps: Trying to open the file with a different or incorrect extension may cause the ‘Excel cannot open the file because the extension is not valid’ error.

Try any of these workarounds to fix the error and regain access to your Excel file data: Workaround 1 – Change the Default File Formatīy default, an Excel file is saved in. How to Fix ‘Excel Cannot Open the File Because the Extension Is Not Valid’ Error? If you have any issues with your order, please contact StackCommerce.Check out this video for a quick demonstration of how to fix “Excel Cannot Open the File Because the Extension Is Not Valid” The promotion isn't expected to stick around for long, and this is the lowest price offered through StackCommerce since the retailer's holiday sale.ĭisclosure: The GameSpot Deals storefront is run by one of GameSpot's affiliate partners, StackCommerce. Again, this likely isn't a huge deal for most people, as $50 is a bargain for even just Microsoft Word-and the 2021 version of Office is still excellent today.īe sure to redeem your license within 30 days of purchase or return an unredeemed code for store credit. It's worth noting that purchasing Microsoft Office 2021 means that you won't receive regular software updates that are offered to Microsoft 365 subscribers. Considering that most users are buying Microsoft Office for Word, Excel, and PowerPoint, these concessions probably aren't dealbreakers. You also only get the 'basic' version of Teams with the Mac license.

The Mac version comes with everything listed above except for Publisher, Access, and Skype for Business. Here’s a look at the software included with Microsoft Office 2021 Professional for Windows:

Excel version 2021