Learn how to always open PDF files in Protected View in Word. Stop Word from opening PDF files in Protected View using GPEDIT or REGEDIT.

The PDF file type is most commonly associated with Adobe Acrobat Reader. To be able to open these files you need to make sure that this program is properly associated with this file type.

No matter your operating system, knowing how to combine PDF files is a good skill. We'll teach you the best ways to do so for Windows, macOS, or via the web.