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I've released an Alpha-Version of my project "Java-RPG-Maker-MV-Decrypter", which works with whole directories and save/renames files by itself...
It has a GUI, try it out! If you just want to decrypt single files, I recommend this version here. (Since you don't need to download it). For whole directories, you should try the Java version of the decrypter! =)

Petschkos RPG-Maker MV & MZ-File Decrypter

PNG-Files (Images - ".rpgmvp & .png_-Files") don't need the decryption code, except you want to re-encrypt them. Please go here for restoring images without a key.


In this area you can De- and (Re-)Encrypt Files from RPG-Maker MV & MZ Games.

You can get the decrypt code from the file:

Click "Detect" after you selected the System(.json) file. If you know the key, you can also just enter it in the text box.


Full Game ZIP

เลือก ZIP เกมเต็มไฟล์เดียว ระบบจะแตกไฟล์ชั่วคราวในหน่วยความจำ, หาโฟลเดอร์เกมและ encryption key อัตโนมัติ, ถอดรหัสไฟล์ทั้งหมด, แทนที่ไฟล์เข้ารหัสในตำแหน่งเดิม แล้ว ZIP กลับเป็นเกมเต็มอีกครั้ง

Select Files & Info

1. Decrypt Code
2. Select File(s)
Advanced
Verify Fake Header?
(?)

This checks if the file header is correct (start of the file).

The header is only important for encryption (decryption can ignore it).


In very rare cases some games use different header settings. You can find the correct header settings in:
"Game Directory"/www/js/rpg_core.js
Search for "function Decrypter()"; there, you can find all values.

File-List

3. Download File(s)
(i)
There is a size limitation depending on your memory and your browser... To handle MANY files (500+mb), you should use the Java-Decrypter!
(?)
Removes all files from the list below

In this area, you can restore PNG files (images - ".rpgmvp & .png_-Files") from RPG Maker games without the decryption key.


Select RPGMVP / PNG_ Files

1. Select File(s)

File-List

2. Download File(s)
(i)
There is a size limitation depending on your memory and your browser... To handle MANY files (500+mb), you should use the Java-Decrypter!
(?)
Removes all files from the list below