How to resolve Excel files that won't open because extension become .xlsx?
Sometimes, when you try to open or edit an Excel file on Microsoft Office 2003, 2007, 2010, 2013 or 2016, you may encounter the following problem:
"Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file."
It usually indicates the file is not compatible with the Excel version or the file has come corrupt or damaged. In this article, we will show you all the possible solutions, and you can try them respectively until fixing the issue.
Two simple methods are provided to fix Excel quickly cannot open the file issue.
1. Change the Excel File Extension
Step 1. Open Microsoft Excel and go to the "File" tab.
Step 2. Click "Export" and choose "Change File Type".
Step 3. Change the file extension to any other file format that MS Excel supports and click "Save As". Then, Check if Excel can open your file or not.
2. Open the Excel File in Safe Mode
Step 1. Press Windows+R key, type: excel.exe /safe and click "OK".
Step 2. Save the file as .xlsx. It sometimes helps to access your data if Excel cannot open the file.xlsx because of the file corruption.
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