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After several months. I found a awesome extractor by a clever engineer: Bakin Extractor

• How to use：

python unpack.py rbpack_path output_directory

A repo for researching how to unpack game made of rpg develop bakin.

RPG Developer Bakin is a new engine making game.

And apearly there are nothing on the internet show how to unpack game file of bakin games.

I wonder how bakin packed game file and make its own struct. So I started to research their encoding and game files.

I know little about bakin. So I google it and asked some of my friend also know little about bakin.

All I got is that bakin is a new version of SGB, also known as Smile Game Builder.

There are less bakin discussion on internet. But there are more discussion about SGB.

This section is based on a tweet from x. Also some of my inference. SGB using a special file format called .sgbpack. And it has a certain pattern on its encoding:

• In the early edition of SGB using zip to pack its game file.
  • But it change the file header from zip: 50 4B 03 04 14 00 00 00 to its own header: 59 55 4B 41 52 50 4B 47 (YUKARPKG)
• But official soon change the method how they encoding:
  • 53 47 42 44 41 54 00 01 (SGBDAT)
  • Nobody know how to deal with it.
  • And it has lots chance that Bakin still using this encoding.

In the bakin I assume it use .rbpack to packed game file.

• I found that header is 42 4b 4e 50 41 4b (BKNPAK).

I found out that bakin will create temp file during games at the windows temp path:

• C:\Users\{username}\AppData\Local\Temp\bakin_engine_tmp

There are many .rbr file. Still have no clue how to deal with it.