How would you like the feature to work?
You are creating or modifying a presentation file and you click on the red arrow in the right upper corner of the window. At that moment you lost al your work.
In this situation a conformation must be ask "Must the changes be saved?" (see attachement)
Why is this feature important to you?
Because I have lost already some work in the past, where other programs like WORD have an extra confirmation message.