Are you trying to launch PowerPoint from Director or are you trying to embed a PowerPoint presentation and run it on the stage in Director?
I am trying to launch the pps file from a Director movie. I am using Director 8.5
then try searching this forum or other forums such as the one at director-online.com (DOUG) for the terms, 'open()' or 'open command' or buddyAPI's 'baOpenFile'. BuddyAPI is probably the most popular Xtra for Director.