Open XML Paper Specification (also referred to as OpenXPS) is an open specification for a page description language and a fixed-document format. Microsoft developed it as the XML Paper Specification (XPS). It is an XML-based (more precisely XAML-based) specification, based on a new print path (print processing data representation and data flow) and a color-managed vector-based document format that supports device independence and resolution independence.
The file that stores macro-enabled slide shows and presentations. PPSM stores a set of slides with graphics, audio and video information, which cannot be edited. It’s used solely to view the generated presentations. To run PPSX file macros, you should first save the file with the PPSM extension.