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When you open a file in Excel, you get an message that the file name extension doesn't match the actual file format. For example, the file has an .xlsx file name extension but it's really a text file and should have a .txt file name extension.
1 Φεβ 2024 · Rename the file extension to match the format of the file, such as .xlsx or .xls: Right-click on the Excel file then go to properties > General tab > Rename the file extension. Repair your Excel file: Repair a corrupted workbook - Microsoft Support. Change Trust Center settings: 1) Open any Office program and click on "File" in the top left corner.
10 Ιουν 2021 · I can't open two of my Excel files. Message says "file format or file extension is invalid" Both are files I have been using for quite some time before this happened two days ago. I haven't changed the names. They are .xlsx files, saved on OneDrive.
22 Ιαν 2023 · Sometimes, the problem occurs due to the unsupported file extension of your Excel file. Step 1. Open your Excel application and then tap the “File” tab. Hit the “Export” option from the list of menus and select the “Change File Type” option. Step 2. Change files extension to some other file format that is well supported by Excel ...
15 Ιαν 2021 · Here's a look at how to restore file associations if Excel won't open: In Windows 10: In the Windows Search Box, Search for 'Default apps'. Click on the 'Set defaults by app' option lower down in the list. Select Excel in your Default Programs list and click the 'Manage' button.
When Microsoft Excel detects a corrupted workbook upon opening, it automatically starts File Recovery mode and attempts to repair the workbook. If File Recovery mode doesn’t start, try using this manual process to recover your workbook:
12 Αυγ 2023 · If you’re experiencing an invalid extension error when trying to open an Excel file, there are a few common causes to consider. Here are the usual culprits, beginning with the most common.
