Excel File Format or File Extension Is Not Valid: 8 Ways to Fix It

Excel is a critical tool for many people in their professional and academic endeavors. A frequent challenge faced by users is encountering the error message ‘Excel cannot open the file because the file format or file extension is not valid.’ This issue often arises when trying to open Excel files, effectively acting as a barrier that prevents access to important data.In this article, we delve into the meaning of this error message, its causes, and most importantly, how to resolve it