How to Fix the “The File is Corrupt and Cannot Be Opened” Error in Excel 2010, 2013, and 2016

Microsoft Excel remains the gold standard for spreadsheet management in both professional and educational environments. However, interoperability between different versions of the software can sometimes lead to frustrating errors. One of the most common issues users face when migrating from older versions to Excel 2010, 2013, or 2016 is the inability to open legacy .xls files (the standard format for Excel 97-2003).

When attempting to access these older spreadsheets, the application often blocks access to protect the system, resulting in a confusing error message. This article provides a comprehensive guide on why this happens and offers two proven methods to resolve the issue effectively.

Understanding the “File is Corrupt” Error

When you try to open a legacy .xls file in a modern version of Excel, the software’s security protocols kick in. Instead of opening the spreadsheet, the system displays a critical error message stating: “The file is corrupt and cannot be opened.”

Screenshot of the Microsoft Excel error message stating the file is corrupt

While this message suggests that your data is damaged or lost, that is often not the case. The file is usually intact; the issue lies in the stricter security settings of newer Office versions, which flag older file formats as potential security risks. Fortunately, you can bypass this restriction by adjusting your settings or repairing the Office suite.

Method 1: Adjusting Protected View Settings in Trust Center

The most direct way to resolve this conflict is to modify how Excel handles files from potential “unsafe” locations or older formats. This involves changing the Protected View configurations within the application’s Trust Center.

Step-by-Step Instructions:

1. Launch Microsoft Excel and open a blank workbook.
2. Navigate to the File tab in the top-left corner.
3. Select Options from the menu to open the “Excel Options” dialog box.
4. In the left-hand sidebar, click on Trust Center.
5. Click the Trust Center Settings… button located on the right side of the window.

Animation showing how to navigate to the Trust Center Settings in Excel

Once you are inside the Trust Center, you need to locate the Protected View tab on the left menu. Protected View is a sandbox mode designed to open potentially dangerous files in a read-only state specifically to minimize harm to your computer. However, this feature is often aggressive towards legitimate older files.

To fix the error, look for the following three checkboxes in the Protected View pane:

• Enable Protected View for files originating from the Internet.
• Enable Protected View for files located in potentially unsafe locations.
• Enable Protected View for Outlook attachments.

Uncheck all three boxes to disable these restrictions.

Screenshot of the Protected View settings in Excel Trust Center with options unchecked

Important Security Note: By disabling these options, you are turning off the automatic protection that screens files for malicious code. This solves the “file is corrupt” error because Excel no longer blocks the file upon entry. However, you should only perform this action if you trust the source of the file. Once you have successfully opened and saved your document (preferably converting it to the newer .xlsx format), it is highly recommended to return to this menu and re-enable the Protected View settings to maintain system security.

Method 2: Repairing the Microsoft Office Installation

If adjusting the security settings does not resolve the issue, the problem might stem from a corrupted installation or configuration conflict within the Microsoft Office suite itself. Running a repair operation can fix missing system files or registry errors that prevent Excel from functioning correctly.

Follow these steps to repair your Office installation:

1. Press the Windows key (or click Start) and type “Control Panel,” then open it.
2. Navigate to Programs > Programs and Features. Alternatively, simply select Uninstall a program if you are in Category view.
3. Scroll down the list to find your version of Microsoft Office (e.g., Microsoft Office Professional Plus 2013 or 2016).
4. Right-click on the application and select Change.
5. A dialog box will appear asking how you would like to repair the Office programs. Select Repair (or “Quick Repair” / “Online Repair” depending on your version) and click Continue.

Allow the process to complete. The system will scan for discrepancies and automatically replace bad files. Once finished, restart your computer and attempt to open the .xls file again.

Conclusion

The transition between older and newer technology standards often results in compatibility hiccups, such as the “The file is corrupt and cannot be opened” error in Excel. By either relaxing the Protected View restrictions in the Trust Center or performing a System Repair on your Office suite, you can regain access to your important data without losing any information.

Remember to prioritize data security: if you choose to disable Protected View, ensure your files come from reputable sources, and consider re-enabling the security features once your task is complete.

References:

• Microsoft Support: file validation failures.
• TechCommunity: Troubleshooting Excel opening errors.
• Office Watch: Managing Trust Center settings.