How to fix Excel file format and extension don’t match? To fix the “Excel file format and extension don’t match” error, first check if the file extension matches its format. Try renaming ...

With Office 2007, Microsoft introduced entirely new file formats for Word, Excel, and PowerPoint. Designated by an x at the end of the file extension (.docx instead of .doc, and so on), these were ...

To know the culprit, open MS Excel (normally) and navigate to File > Options > Add-Ins > COM Add-ins. Now, remove these extensions one by one to find out which one is causing the issue.

Microsoft Excel files -- and other formats that Microsoft Office applications generate -- can provide delivery mechanisms for malware payloads. Microsoft increased the power and range of its ...

It also enhances the readability of file listings by hiding known file extensions (such as .xlsx for Excel files or .docx for Word files) so that it’s less confusing for you to find what you ...

Excel displays a warning message that the file format and extension don’t match (HTML table and XLS), but allows the user to open the file anyway. Today, users reported that these reports no ...