CDecrypt 2.0 is a command-line utility used to decrypt Nintendo Update Server (NUS) content files from the Wii U. It is a critical tool for the emulation community, particularly for users of the Cemu emulator, as it converts raw encrypted files (like .app and .h3) into a readable format consisting of code, content, and meta folders. Key Features of CDecrypt 2.0
Modern versions of this tool, such as those maintained on GitHub by VitaSmith, include several improvements over the original release:
No External Dependencies: Unlike earlier versions, it does not require OpenSSL libraries, operating as a standalone executable.
Cross-Platform Compatibility: While primarily used on Windows, it can be compiled for Linux and macOS.
Enhanced File Handling: It supports international characters and can automatically deduce the location of .tmd and .tik files if a directory is provided.
Simplified Usage: It often allows users to simply drag and drop a folder onto the executable to begin the decryption process. How to Use CDecrypt 2.0
To manually decrypt Wii U game data for use in emulators, follow these steps:
Prepare Your Files: Ensure your game folder contains the necessary encrypted files, specifically title.tmd and title.tik. cdecrypt 2.0
Setup the Tool: Place the cdecrypt.exe and any required .dll files into the same folder as your encrypted data. Execute via Command Line: Open a command prompt (CMD) in that directory.
Run the following command: CDecrypt_v2.0b.exe title.tmd title.tik.
Verify the Output: Once finished, three new folders will appear: code: Contains the game’s executable (.rpx file). content: Contains the game's assets and data.
meta: Contains icons, metadata, and the meta.xml file required for Cemu to recognize the game. Common Use Cases
CDecrypt 2.0 is a lightweight command-line tool used to decrypt raw Wii U files (like .app and .h3 files) into a format that the Cemu emulator or a hacked console can read. 📋 Prerequisites Before you start, make sure you have:
The Game Files: A folder containing raw game data (usually full of .app and .h3 files, along with a title.tmd and title.tik).
CDecrypt 2.0: The zip file containing cdecrypt.exe and its required .dll files. 🛠️ Step-by-Step Guide Step 1: Prep the Folder Extract the contents of the CDecrypt zip file. CDecrypt 2
Copy all extracted files (including cdecrypt.exe and the .dll files).
Paste them directly into the folder containing your raw .app and .h3 game files. Step 2: Open Command Prompt Navigate into that folder.
Hold Shift and Right-Click on an empty space inside the folder.
Click "Open PowerShell window here" or "Open Command Window Here". Step 3: Run the Command
In the command window, type or paste the following exact string and press Enter:CDecrypt_v2.0b.exe title.tmd title.tik
(Note: If you are using PowerShell, you may need to type ./CDecrypt_v2.0b.exe title.tmd title.tik instead). Step 4: Verify the Results
Once the command finishes running, CDecrypt will have created three brand-new folders in that directory: 📁 code (Contains the executable .rpx files) 📁 content (Contains the game assets) 📁 meta (Contains icons and game information) ⚠️ Troubleshooting Tips ⚠️ Important Legal & Ethical Notice This guide
Missing DLL Errors: If the app fails to launch, ensure you moved the accompanying .dll files from the zip into the game folder, not just the .exe.
No "title.tik" or "title.tmd": Check if your files have slightly different names. If your files are named something like title.tmd.1, rename them to remove the extra extension before running the command.
Streamlining the Process: If you want to avoid manual extraction entirely in the future, look into applications like WiiUDownloader or check the "unpack" option in your download manager to have files decrypted automatically. If you'd like, let me know:
What Operating System you are using (Windows, Linux, or Steam Deck?) Whether you are decrypting a base game, an update, or a DLC
Xpl0itU/WiiUDownloader: Allows to download encrypted ... - GitHub
⚠️ Important Legal & Ethical Notice
This guide is provided for educational purposes only. CDecrypt is a tool for decrypting your own legally dumped game files, typically for homebrew development, modding, or backing up physical cartridges you own. Do not use it to circumvent copyright for games you do not legally own.
Each .app is decrypted using AES-128-CBC with the title key. The resulting raw data is either:
# Decrypt .3ds to folder + decrypted file
cdecrypt game.3ds
3. Automatic Ticket & Key Derivation
While original CDecrypt required a separate ticket.bin in the folder, version 2.0 can extract the ticket directly from the title.tmd–title.tik pair. It also supports using an external keys.txt file or compiled-in common key, making cross-platform usage easier.
4. Repack decrypted RomFS back into a playable file
cdecrypt -r input_decrypted.3ds output_repacked.3ds
- Useful after modifying game assets.
The "NUS" Factor
It is important to note that CDecrypt 2.0 works specifically with NUS (Nintendo Update System) formats. This means it is perfectly tailored for those downloading titles from Nintendo’s servers or dumping their own purchased content. It ensures that the output structure (the "content," "code," and "meta" folders) is compliant with what homebrew launchers expect.
Verbose Logging (for errors)
cdecrypt2.exe "D:\Downloads\WiiU\GameName" -v > log.txt