Fork based on original work by matiffeder

An advanced and refined version of the popular batch script for automatic Nintendo 3DS ROM decryption. This fork optimizes the workflow for emulator users, adding support for new formats, cleaner file management, and detailed compression statistics.

This script is provided "as is" for educational and personal backup purposes. Ensure you legally own the games you intend to decrypt. The author is not responsible for any misuse of this tool.

Compared to the original script, this version includes:

• Dedicated Output Folder: All processed files are automatically saved in a decrypted/ subfolder, keeping the root directory clean.
• Native .cci Support: Recognizes, decrypts, and preserves the extension of .cci files (often used for cartridge dumps).
• Compression (Trimming) Statistics:
  • Calculates and displays real-time (in green) how much space was saved by removing dummy/encrypted data for each game.
  • Shows reduction in both percentage and MB.
  • Calculates a Global Total of disk space saved at the end of the batch process (in cyan).
• Clean File Names: Automatically removes unnecessary suffixes like -decrypted or -decfirst. The output file will have the same clean name as the input file.
• Special Character Support: Fixed a critical bug that caused the script to crash with filenames containing apostrophes (e.g., Luigi's Mansion) or parentheses, thanks to improved PowerShell integration.
• Smart Logic for CIAs:
  • .cia Games are converted to .cci (File > Load File in Citra).
  • .cia Updates and DLCs remain .cia (File > Install CIA in Citra).

1. Download or clone this repository.
2. Place your encrypted files (.3ds, .cia, .cci) in the script's root folder.
3. Run the .bat file.
4. Wait for the operations to complete.
5. You will find your ready-to-use files in the decrypted/ folder.

Here is how files are transformed:

Processing: Luigi's Mansion 2
   -> Reduced by 15.40% (-250.50 MB)

Processing: Super Mario 3D Land (Patch)
   -> Reduced by 2.10% (-5.00 MB)

======================================================
 FINISHED!
 Files are located in the "decrypted" folder.

 ------------------------------------------------
 GLOBAL BATCH STATISTICS:
 Total Space Saved: -255.50 MB
 ------------------------------------------------
======================================================