A gpf file extension is associated with the e-book format developed by Ganaxa’s Publishing.
GPF file extension - Ganaxa’s Publishing e-book
What is gpf file? How to open gpf files?
File type specification:
The gpf file extension is related to e-book and document format used by Ganaxa’s Publishing Platform.
GPF is an unprotected XML based format. The DRM protected version has gpx extension instead.
This gpf 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.