An mpp2 file extension is related to the MPEG 2 video header information format. Probably obsolete.
MPP2 file extension - MPEG 2 video header information
What is mpp2 file? How to open mpp2 files?
File type specification:
The mpp2 file extension is associated with video in MPEG2 video format. The mpp2 file contains video header information.
Most likely some old format without support. No further information could be found.
This mpp2 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.