ROM Hack [Help] Editing files in Cardfight Vanguard: Ride to Victory

[szh]

Hi,

I'm trying to modify the script of this game (to e.g. make a menu patch). I've decrypted the ROM using rxTools on a 4.5 3DS. I have the ExtractedBanner, ExtractedExeFS, and ExtractedRomFS folders, as well as the DecryptedExeFS.bin, DecryptedExHeader.bin, and DecryptedRomFS.bin files. Inside the ExtractedRomFS folder there is a script folder that looks like what I need. However, the files inside the folder have the .rtz extension. I've never seen the .rtz extension before, and a Google search didn't lead to any results.

Furthermore, I've found ctpk files that I know is a 3DS recognised file format. I've tried using https://gbatemp.net/threads/release-ctpk-tool.379796/ to open them, but I get errors that they're not a valid CTPK file. When I open them in a hex editor (I used HxD), I don't see the CTPK header either.

Are all the files somehow still encrypted or compressed? How do I tell?

Thanks very much for any help! I'm really new to this.

 

[szh]

Okay, so I found that ExtractedExeFS\.code.bin contains strings referencing the file locations (e.g. "script/worldmap.rtz"), so I don't think there are problems with the decryption process. I suppose .code.bin is the main code of the game.
I guess the question now is how I can identify and open the .rtz files. Opening them in a hex editor didn't reveal anything special...I need something like a Japanese table or something?

Thanks for any help! T_T

 

[Romsstar]

Okay, so I found that ExtractedExeFS\.code.bin contains strings referencing the file locations (e.g. "script/worldmap.rtz"), so I don't think there are problems with the decryption process. I suppose .code.bin is the main code of the game.
I guess the question now is how I can identify and open the .rtz files. Opening them in a hex editor didn't reveal anything special...I need something like a Japanese table or something?

Thanks for any help! T_T

Like with almost any game you are facing a format that was custom made for this game. In order to achieve what you want to achieve, someone has to reverse-engineer this format and write the appropriate tools for it. Tables aren't used nowadays anymore, at least in modern games they're not.

 

[szh]

hmm alright thanks!

Upon further digging, it seems like every single file (regardless of extension) contains a gzipped file with the exact same name. Removing the first 4 bytes allows extraction with any decompressing tool that supports gzip. For example, removing the first 4 bytes of worldmap.rtz and decompressing using gzip results in a file worldmap.rtz, which does seem like the file I want. That's some progress, at least...

Guess the Japanese part will come later :X

 

[ulfred5000]

Is there any chance you still have the decrypted file? If so could you please upload it as I don't want to buy another 3DS and don't have the appropriate tools for decrypting the ROM myself.

 

[WannyTiggah]

Is there any chance you still have the decrypted file? If so could you please upload it as I don't want to buy another 3DS and don't have the appropriate tools for decrypting the ROM myself.

Asking for decrypted files is a no no.