The file is not compatible with Excel: It turns out that this problem can also occur because the file where the problem occurs is not compatible with Excel. What is the cause of the “File format and extension do not match” error in Excel
We will also explain to you how to recover MS Excel data. In this article, we will explain the common causes of this error and discuss some effective solutions to fix the. All previously saved data will be deleted when you click the “Yes” button. The error message `Document format and file extension do not match’ when a user attempts to open certain files in Microsoft Office, including Microsoft Excel. Make sure the file is not damaged and that the file extension matches its format.” “ Excel cannot open the file `Filename.xlsx` because the file format or extension is invalid.
When trying to open or edit an Excel file in MS Office, many users report the error “Excel cannot open the file because the file format or extension is invalid.” Update: Stop getting error messages and slow down your system with our optimization tool. How do I fix the format and extension of a Microsoft Office Excel document that does not match, the file may be corrupt or unsafe?.How do I open a file with the wrong extension?.How to solve the “File format and extension do not match” problem in Excel?.