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The Ultimate SB3Utility Tutorial: Modifying, Fixing, and Reverse-Engineering Scratch 3.0 Files

If you have ever downloaded a .sb3 file from Scratch (the popular visual programming language) and wished you could batch-rename sprites, extract all sounds at once, or fix a corrupted project, you have likely hit a wall. The standard Scratch editor doesn't allow advanced file manipulation.

Enter SB3Utility. This open-source tool is the Swiss Army knife for Scratch 3.0 files. In this comprehensive tutorial, we will cover everything from basic installation to advanced scripting, ensuring you can manipulate .sb3 files like a pro. sb3utility tutorial

4.2 Locate the Target Texture

  • Expand the tree: cab-[hash] > AssetBundle > Asset.
  • Look for assets named Texture2D.
  • Click on a texture to preview it (e.g., a shirt pattern).

5.1 Export a Mesh

  • Open a .unity3d file containing a Mesh asset.
  • Select the mesh (e.g., cm_body_00).
  • Right-click > Export > as .obj or .fbx.

5. Importing and replacing files

  • Right-click a file → Replace to swap with a local file (useful for modding).
  • To add new files, right-click a folder → Import.
  • After changes, save export as a new NSP/XCI or rebuild only the modified partition.

Part 1: Installation and First Launch

Part 3: Basic Tutorial – Extracting All Media from a Project

Scenario: You created a game on Scratch and want to use a specific sound effect in a professional video editor, but you lost the original MP3. Expand the tree: cab-[hash] > AssetBundle > Asset

Step-by-step:

  1. Open the SB3 file: In SB3Utility, navigate to your .sb3 file using the left Explorer panel. Double-click it.
  2. View the structure: The right panel now shows a tree: Project > Stages > Sprites.
  3. Navigate to assets: Expand Sprites > Sprite1 > Sounds.
  4. Export:
    • Right-click the sound file (e.g., Meow.wav).
    • Select Export.
    • Choose a destination folder on your PC.
  5. Repeat for costumes: Navigate to Costumes and export the SVG or PNG files.

Pro Tip: To export everything at once, right-click the root Project node and select Export All Assets. This saves every sprite, script, sound, and costume into organized folders. and costume into organized folders.