A vba macro could work out what drive the presentation's on and get the drive
letter from that, but VBA won't work in all cases. The user may have disabled
it, or you might be running in the free viewer, where VBA doesn't work at all.
There are no action butttons that control other programs (except as you've seen,
to launch them). Unless maybe the program had a command line to shut itself
down. That'd be a very unusual program.