We're having an issue on Dell Latitude 10 tablet which seems to be hard to resolve.
I've configured Windows reader as default program for all PDF files.
When opening PDF files in a Powerpoint presentation the following Microsoft Office notification pops up:
Some files can contain viruses or otherwise be harmful to your computer.
It is important to be certain that this file is from a thrustworthy source.
Would you like to open this file?
When clicking OK, the file opens. It is asked every time when opening a PDF link in the presentation.
Same issue when you configure Adobe reader touch as default.
When setting Adobe Reader XI as default, you don't get the message. But then, we don't want the files to open in that last one.
We've been searching to resolve this in the powerpoint options e.g., but without success.
Thanks to everyone who can give us a lead.