Powerpoint warning

hello everyone,
i have a problem - my powerpoint presentation dosen´t play. If I want to play its come the message “would you like to open or safe the datei” i know it is a securitysystem on microsoft but i would to know how i can play a powerpoint presention without translation from pptx to mp4 datei.

My Xibo version is 1.8.1

Please have a look here http://xibo.org.uk/manual/en/media_module_powerpoint.html if those registry changes would not work for you, please also see this PowerPoint media items show a "Navigation Cancelled" error when running on the Windows Player / PowerPoint brings up an Open Dialog