Microsoft Excel opens files in various formats, such as .xls, .xlsx, .xlsm, .xlsb, .xltx, .xml, and many more. This error also gets worse. If you click Yes, the file opens anyway, but with all of its content missing. Of course, like all error messages, the format and extension don’t match error can be as a result of other underlying issues, the most common of which is that the document is deemed to be corrupt. Here is what to do when faced with this challenge.

How do I fix format and extension don’t match in Excel?

1. Unblock access for safe files

2. Add the workbook to a Trusted Location

In Microsoft Excel 2010, 2013, and 2016, saving a file to a Trusted Location lets the program view it as safe. Excel comes with default trust locations, and you can add others by clicking the Add new location button. Save the problematic worksheet in a trust location and try to open it again. However, you must note that if a malicious person places a file in a trusted location, Excel will overlook this document also.

3. Repair the workbook to fix file format and extension don’t match error

These solutions above should clear the file format and extension don’t match error. However, if all fail, backing up the workbook or creating a recovery file can salvage your data. SPONSORED In the next section, we will explore how to recover data from the problematic file, as well as how to back up the workbook.

4. Change the calculation setting to manual from automatic

Now open the workbook and confirm that the file no longer gives the file format and extension don’t march error or opens blank sheets. In conclusion, the file format and extension don’t march error comes, especially when you rename an Excel file to another extension. We have looked into troubleshooting this issue by unblocking files, saving and opening the workbook from a trusted location, and repairing the file. Also, we went over preventive measures to take on your worksheet, so that you do not lose data. Are you experiencing this issue or got it in the past? How did you resolve it? We appreciate your comments and will get to as many as possible.

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