If File Explorer Preview for PDF is not working or displaying correctly and shows ‘INDEX OF…’ under Network folders, here's what you need to do.

PDF Preview is basically a free Windows Explorer add-on and a PDF viewer application. It automatically adjusts Windows Explorer settings to enable the previewing of PDF files in the Preview Pane.

Windows Explorer displayed .pdf files as preview thumbnails on Zill Niazi’s old Windows 7 laptop. But on a new laptop, also running Windows 7, it displays them only as icons. Can this be fixed ...

There are plenty of File Explorer alternatives for Windows 11, but really, you don't need them. And with PowerToys, you can make it even better.

The Preview Pane add-on offers a way to view more types of files without having to open them. Learn how to use this helpful tool.

Windows 10's built-in File Explorer doesn't look very modern. Files UWP - Preview brings a modern file explorer experience that's touch and mouse-friendly, and it looks stunning.

File Explorer finally has tabs—but you'll have to join the Insider Preview program to try them out.

If you are on Windows 11, you can then select "Show More Options" and then "Open". You can skip the "Show More Options" step in Windows 10.