Unpack .pak file for Touhou The Genius of Sappheiros: Weekend

[Ven]

Hello, I'm working on a translation for the PSVita version of The Genius of Sappherios, and since there's already a translation for the pc version I thought I might see those for ease of use.
Unfortunately the pc game (and translation) uses .pak files, and I can't figure out how to unpack them, can anyone help me? Thanks in advance.

Link for the translation .pak files: https://www.mediafire.com/file/l0jyl7e6 ... s.rar/file

[aluigi]

The first 32bit number is the only thing in clear-text, everything else seem encrypted/obfuscated.
The only thing I noticed is the block of data starting from about offset 0x9ba1c0 of Game.pak which is a sequence of the same 64 bytes, but it's not a xor key and probably not related to any block cipher encryption.

[Ekey]

Edited: I looked at my old source codes and found the Touhou Monsters Card game, I make tool for unpack files - 7 years ago. Format and encryption is absolutely identical



Encryption: Mersenne Twister + Xor (64 bytes key)

[Ekey]

Done!

Binaries: here
Sources: here

[DJ Normality]

yo thats crazy thanks Ekey have to check it out