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.

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.

This absolutely goes into my Toolbox. If you receive pdfs via email and have been frustrated with the lack of being able to preview those attachments in Outlook 2007, you should give Foxit PDF ...

In the Preview app, for example, it's possible to create a single multi-page PDF document out of several separate image files.

Fortunately, Apple has added the ability to electronically sign a PDF document using Preview, a program that comes preinstalled on every Mac running OS X Lion or later.

Microsoft says the Outlook PDF preview feature might be broken for some Microsoft 365 customers on systems where the company's PowerToys open-source toolset is also installed.