Monthly Archives: October 2014

Security prompt when opening PDF files (and probably others)

Suddenly we started getting the security prompt when opening PDF files.  You can click Yes, but it unblocks only that single file.  This can be eliminated via Group Policy:

Via GPEDIT.MSC, navigate to:

Local Computer Policy
User Configuration
Administrative Templates
Windows Components
Attachment Manager

Enable the “Inclusion list for low file types” policy and add the file type(s) with a leading period and trailing semicolon like this:

.pdf;.gif;