How to open GGP file?

Although I don't know how to open this thing, I can tell you what IIS someone will use to answer to open it. Remember, this is pure confusion and deception. Just leave it alone. IIS is a server configuration file, and GGP is a game static gallery compression, which is completely different. GGP is a file type produced by a Japanese game company. But at present, I haven't found the relevant unpacking tools. I hope that when I find it, we can study it together. I played "Artificial College".