There is only one file type that uses the .MPH extension:
Photostory Deluxe Project
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.
|MAGIX Photostory Deluxe||Commercial|
Updated: December 1, 2014