If you found this file in a research context, it might be a package from one of PSU's digital archives:

Penn State defines as the use of digital media—video, audio, and geospatial maps—to present research or narratives.

: A common format at PSU is the ArcGIS StoryMap, which combines maps with narrative text.

HIST 12: History of Pennsylvania: Primary Sources - Library Guides

: There is a pypsu library used for creating and analyzing PlayStation 2 PSU files, which might be the "source" if your project is technical.

: This repository is used by the PSU community to share and preserve research files.

: Many "stories" at PSU are built from digitized primary sources , such as historical images, oral histories, or government documents. 💻 Technical Code or Scripts