I have a problem with PowerPoint files in EW6.5.5. Other items works OK but PP-files appear in the PP-application (2007) instead of EW.
That means on monitor 1 (behind the schedule), My operativ system is Windows 10. When using EW2009 in the same computer everything works completely perfekt.

HI!

I am sorry that you are having this issue. Open EW and click on EDIT//OPTIONS//ADVANCED and make sure box that read " Use the PowerPoint Viewer instead of the Full PowerPoint Application" is not checked. Try this and see if it will help.