Fix Adobe Acrobat Reader could not open PDF because it is either not a supported file type or because the file has been damaged error on PC.

You can allow or block Microsoft Edge from opening PDF files externally by changing some settings using Registry Editor or Group Policy Editor in Windows 11/10.

If you have a confidential PDF you want to password protect, you have a few ways to do that on your Windows 11 PC. You can use a desktop app or a web-based tool to encrypt your PDF files.

PDF files can be weaponized by malicious actors to steal Windows credentials (NTLM hashes) without any user interaction, and only by opening a file, according to Assaf Baharav, a security ...