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How to Fix File Explorer Preview Pane Blocking Files in Windows
Question details
Users encounter a security warning or a blocked preview in the Windows File Explorer Preview Pane when selecting certain downloaded files.
- Product
- Windows File Explorer
- Device & OS
- Windows
- Scenario
- Attempting to preview documents or files downloaded from the internet using the File Explorer Preview Pane.
- Observed behavior
- The preview pane is automatically disabled or displays a warning message stating that previewing the file could harm the computer.
Ensure that the file you are trying to preview comes from a reliable and trusted source, as bypassing security warnings for malicious files can harm your computer.
Unblock the Downloaded File Manually
Since Windows automatically blocks previews for files containing the 'Mark of the Web' (downloaded from the internet), you can manually unblock individual trusted files to restore their preview functionality.
This blocking behavior was introduced as a deliberate security measure in a Windows update. It protects your system by preventing potentially unsafe internet files from automatically executing code in the preview pane.
Open Windows File Explorer and navigate to the folder containing the file that is currently blocked in the preview pane.
Right-click on the downloaded file and select 'Properties' from the context menu.
In the General tab, look for the 'Security' section at the bottom. Check the box or click the button that says 'Unblock', then click 'Apply' followed by 'OK'.
Submit Feedback for Windows Security Changes
If you believe a safe file type is being blocked unnecessarily, you can report the behavior to Microsoft to help improve future security updates.
Open and Edit Documents Safely with WPS Office
If Windows File Explorer continues to block your Microsoft Office document previews, you can safely open, view, and edit your Word, Excel, and PDF files directly using WPS Office. It provides a highly compatible, free, and lightweight alternative with a familiar user interface, ensuring a seamless migration from Microsoft Office.
- 1. Download WPS Office: Visit the official WPS website to download and install the lightweight WPS Office suite on your Windows PC.
- 2. Launch the application: Open WPS Office and familiarize yourself with the clean, tabbed interface designed for optimal productivity.
- 3. Open your files safely: Use the 'Open' menu to locate your downloaded internet files and view them securely within the WPS Office environment.
Frequently Asked Questions
Why did File Explorer suddenly start blocking my document previews?
Microsoft introduced a security update that automatically disables the Preview Pane for files downloaded from the internet. This prevents potentially malicious code from executing without your knowledge when the file is previewed.
Is it safe to bypass the File Explorer preview warning?
You should only unblock and preview files if you are absolutely certain they come from a trusted and verified source. Unblocking and previewing malicious files can compromise your system's security.
Can I disable this preview security feature for all files?
It is highly discouraged to disable this feature globally, as it leaves your computer vulnerable to internet-based threats. Instead, you should manually unblock individual trusted files via their Properties menu.
