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 ...

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

Solution 7: Open MS Excel in Safe Mode Solving the “ Excel cannot open because the file format is not valid ” problem can sometimes be as simple as booting your computer into Safe Mode . This is ...

For those cautious about third-party software, LibreOffice is a free and open-source alternative that supports various file types. If the file opens in LibreOffice, save a duplicate, which will then ...

Suppressing the warning lets Excel open the file without checking for format mismatches. This is useful if you trust the file and want to avoid repeated alerts.

What version of Laravel Excel are you using? 3.1.48 What version of Laravel are you using? 9.51.15 What version of PHP are you using? 8.1.3 Describe your issue Whenever I try to export to XLS or XLSX, ...