Hi,
Links from questions that were migrated from Microsoft Community are now inaccessible because the MS Community has been retired. To help you with your issue, are you talking about bulk unblocking files? This is a known issue with the recent version of Windows. The common fix is to unblock the file to get rid of the warning. However, if you want to bulk unblock files on multiple folder locations, you may try running this command in Windows PowerShell
- Right-click on the Start menu button > Terminal (Admin)
- Ensure the tab says "Administrator: Windows PowerShell". Otherwise, click on the down arrow next to the + button and select Windows PowerShell
- Type or paste this command then press Enter key
get-childitem "full path of folder" | unblock-fileFor example:get-childitem "C:\Users\%username%\Downloads" | unblock-file
Another workaround is to use Microsoft PowerToys to preview them. The option to enable in the app is under File Management > File Explorer add-ons > PDF. You may also enable Peek so you can press Ctrl + Spacebar to display a popup preview of the PDF file.