go get -u github.com/oriath-net/pogo

You'll need to have Go 1.18 or later installed.

pogo ls Content.ggpk:Data

pogo ls 'Path of Exile':

pogo ls some_files.zip:subdirectory/

List the contents of a GGPK file, Steam install, or PKZIP archive, including files within bundles if appropriate.

The colon in this (and other) commands is significant; it separates files in the real filesystem on the left from files within the virtual filesystem on the right.

(Support for PKZIP archives is provided as a utility for developers. The game never naturally provides data in this format.)

 pogo cat --utf16 Content.ggpk:Metadata/StatDescriptions/stat_descriptions.txt

Output the contents of a single file in the GGPK to standard output, converting UTF-16 to UTF-8 for output.

pogo extract Content.ggpk:Audio/

Extract all audio files from the GGPK.

pogo data2json Content.ggpk:Data/WorldAreas.dat

Dump a data file to JSON. Data file formats are specified in dat/formats; the contents of that directory are embedded in the pogo executable.

The jq tool is incredibly useful for displaying and manipulating JSON data, and is highly recommended.

pogo analyze Content.ggpk:Data/WorldAreas.dat

Analyze the contents of ActiveSkills.dat, providing information which may be useful in interpreting it.

Most of these commands have a bunch of additional options; they can be viewed from within the application using e.g. pogo help cat.