If you have a PowerPoint presentation saved as a PowerPoint Presentation (.ppt):
- Right-click the file and choose Show.
If you have a PowerPoint presentation saved as a PowerPoint Show (.pps):
- Double-click the file.
To save a presentation as a PowerPoint Show, choose File → Save As and select PowerPoint Show from the Save As Type drop-down list.
When you launch a show from a file (.ppt or .pps), it will be presented as configured in the Set Up Show command. So be sure you have configured Set Up Show options correctly (e.g. what slides to show) prior to saving the file.