The original program was written by 0xFAIL (https://github.com/BlenderCN-Org/SkullMod)
The C++ version was written by ImpDi
Argument, it file or folder. Like: "previous_path/folder" or "previous_path/file.gfs"
Then, Program try pack or unpack this
Just drag and drop the files you want to convert on the programm
Pack and unpack *.gfs