.MPH File Extension
What is an MPH file?
Project created by Photostory Deluxe, an application used to create presentations; contains one or more editable slideshows that consists of images, video, audio, transitions, effects, and titles.
MPH project files are the main units in Photostory Deluxe. Projects allow you to import images, audio, and video, customize your presentation, and export your presentation as a MVM slideshow.
To create a project, select File → Save or Save As....