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How to Fix XLSX Files Opening in Internet Explorer Instead of Excel
Question details
The user needs to associate .xlsx files with Microsoft Excel because the files currently open in Internet Explorer and the extension is missing from the Windows default apps list.
- Product
- Microsoft Excel
- Device & OS
- Windows 11
- Scenario
- Opening a spreadsheet by double-clicking an .xlsx file in the Windows file explorer.
- Observed behavior
- The .xlsx file opens in Internet Explorer instead of Excel, and Excel is completely missing as an option in the Windows file-association list.
Verify that Microsoft Excel is properly installed on your computer by launching it directly from the Windows Start menu and successfully opening a new workbook.
Run Office Quick Repair to Restore File Associations
Using the built-in Microsoft Office repair tool is the most reliable way to restore missing .xlsx registry keys and file associations in Windows 11.
When an Office update fails or registry keys become corrupted, Windows loses the connection between the .xlsx extension and Microsoft Excel. Running a Quick Repair rebuilds these connections without affecting your personal files.
Right-click the Windows Start menu button and select 'Settings', or press the Windows key + I on your keyboard.
Click on 'Apps' in the left-hand sidebar, then select 'Installed apps' to view a list of all software on your computer.
Scroll down to find your Microsoft Office or Microsoft 365 installation. Click the three-dot menu icon next to it and select 'Modify'.
In the pop-up window, select 'Quick Repair' and click the 'Repair' button. Allow the process to complete, then restart your computer and test opening an .xlsx file.
Manually Assign Excel Using the 'Open With' Menu
If the Quick Repair does not set Excel as default automatically, you can manually point Windows to the Excel executable file.
Try WPS Office for Hassle-Free Spreadsheet Management
If Microsoft Office keeps experiencing registry errors or file association issues on Windows 11, consider switching to WPS Office. It provides a lightweight, highly compatible, and completely free alternative for handling all your spreadsheets.
Frequently Asked Questions
Why is Internet Explorer opening my Excel files?
This happens when the Windows registry loses the file association for the .xlsx extension. Without a designated application, Windows 11 falls back on default web browsers like Internet Explorer or Microsoft Edge to handle unknown XML-based files.
How do I add a missing file extension to Windows 11 Default Apps?
If an extension like .xlsx is completely missing from the Settings > Apps > Default Apps menu, the software that handles it must be repaired. Running a Microsoft Office Quick Repair automatically restores these missing registry keys to Windows.
Will running a Microsoft Office repair delete my Excel spreadsheets?
No. Running a Quick Repair or Online Repair only reinstalls the application files, registry keys, and software shortcuts. Your personal spreadsheets, documents, and data will remain perfectly safe.
