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How to Fix Extra Dot After Excel File Extensions on Windows 11
Question details
The user is experiencing an issue where Excel files display an extra dot or character after the .xlsx or .xlsm extension. Removing this extra dot allows the file to open, but the contents appear as unreadable characters, indicating potential corruption or encryption.
- Product
- Microsoft Excel
- Device & OS
- Windows 11
- Scenario
- Transferring Excel files from an old computer to a new Windows 11 laptop, resulting in altered file extensions and unreadable file contents.
- Observed behavior
- An extra dot is appended to the file extension (e.g., .xlsx.) by security software. Renaming the extension allows the file to open, but the data remains unreadable due to encryption applied on the original computer.
Before making any changes, ensure you still have access to the original computer where the files were created, as you will likely need it to decrypt the files if third-party security software was used.
Decrypt Files Using the Original Computer's Security Software
Since the extra dot and unreadable characters are often caused by security software (like McAfee) encrypting files during a transfer, you must decrypt them on the source machine before moving them.
Antivirus and security software suites sometimes lock files when moving them to external drives or new networks. Simply renaming the file extension will not reverse the encryption.
Log into the old computer where the Excel files were originally created and where the security software is installed.
Open your security software (such as McAfee) and use its decryption or vault feature to remove the file protection from your spreadsheets.
Once the files are decrypted and display standard .xlsx or .xlsm extensions without extra dots, safely copy them to a USB drive or network folder and transfer them to your new Windows 11 laptop.
Fix File Name Extensions and App Associations Manually
If your files are not encrypted but simply have an accidental renaming error, you can manually fix the file extension in File Explorer and set your spreadsheet app as the default.
Open Your Spreadsheets Easily with WPS Office
If you are struggling with Excel file associations or need a reliable, cost-effective program to open .xlsx and .xlsm files on your new Windows 11 laptop, WPS Office is a fast, lightweight, and fully compatible alternative.
- 1. Download the installer: Visit the official WPS website and click 'Download WPS Office Free' to get the latest Windows 11 compatible version.
- 2. Install the software: Run the downloaded executable file and follow the simple on-screen instructions to install the suite.
- 3. Set as default spreadsheet app: During the setup process or upon first launch, choose to set WPS Spreadsheets as your default application for opening .xlsx and .xls files.
Frequently Asked Questions
Why do my Excel files have an extra dot at the end of the extension?
An extra dot at the end of a file extension (like .xlsx.) is often caused by third-party antivirus or encryption software, such as McAfee. The software alters the extension to protect, quarantine, or lock the file during transfer.
I removed the extra dot, but my Excel file is full of unreadable characters. What should I do?
This indicates the file's contents are encrypted. Simply renaming the extension fixes the file type, but it does not decrypt the data. You must return to the original computer where the file was encrypted and use the security software to decrypt it before transferring it to your new device.
How do I show file extensions in Windows 11 File Explorer?
Open File Explorer, click on the 'View' menu at the top of the window, navigate to 'Show' in the dropdown menu, and check the option for 'File name extensions'. This allows you to see and edit the complete file extension.
How do I change the default program to open .xlsx files?
Right-click any .xlsx file and select 'Open with' > 'Choose another app'. Pick your preferred spreadsheet program (such as WPS Office or Microsoft Excel), check the box for 'Always use this app to open .xlsx files', and click OK.
