A pgf file extension is associated with the progressive graphics format developed by Xeraina. Probably obsolete.
PGF file extension - Progressive graphics
What is pgf file? How to open pgf files?
File type specification:
The pgf file extension is related to a proprietary compressed bitmap format created by a Swiss company Xeraina.
PGF is an image file format for natural and aerial images, which offers both lossless and lossy compression.
This pgf 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.