Microsoft releases KB5004760 update to fix PDF problems in Windows 10
Microsoft has released an out-of-band update for Windows 10 that remedies a PDF opening issue.
Available for Windows 10 version 2004, 20H2 and 21H1, the KB5004760 update may not seem like particularly important one, but Microsoft deemed it of enough import to release it off schedule. You will, however, have to go out of your way to find it if you need it.