The PSH file extension is a project file extension for the program ProShow which can be used to load or save a slideshow presentation of videos, images, and text. This file type contains all the references and information necessary to load and playback a complete presentation. However, because the file contains only references to the files that are externally linked, moving the project file may cause the files needed for the slideshow not to load and is most commonly problematic when uploading the slideshow to the web.