To fix the “Excel file format and extension don’t match” error, first check if the file extension matches its format. Try renaming the file with the correct extension (e.g., .xlsx for Excel ...

Change the file extension from XLSX to XLS or vice versa and hit Enter. Select Yes in the warning prompt that appears, and the file format will be changed. If changing to the XLSX format doesn’t open ...

For example, if a file has been saved as an Excel spreadsheet, but it has been given the “.txt” extension, it means that the file has been saved as a text file instead of an Excel spreadsheet. This ...

Here's how to fix the “Excel file format or file extension is not valid” problem using 4DDiG File Repair: 1. Install and launch 4DDiG File Repair on your Windows or Mac. Access the File Repair feature ...

[Bug]: Excel cannot be open the file because the file format or file extension is not valid #3987. Copy link. Labels. bug. Description. ruuddeenen. opened on Aug 31, 2023. Issue body actions. Is the ...

Every now and then, when I try opening an Excel file, I get a message saying that "Excel cannot open the file 'file.xlsx' because the file format or the file extension is not valid. Verify that the ...