Files with jpo file extension can be usually found as special data files used by the Japanese National Center for Industrial Property Information and Training (INPIT).
JPO file extension - JPO data format
What is jpo file? How to open jpo files?
File type specification:
The jpo file extension is most likely best known for its use for JPO data file format.
Japio’s JPO data service offers standardized JPO data prepared by National Center for Industrial Property Information and Training (INPIT) Japanese Government office, as well as original JPO data, for marginal cost.
This jpo 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.