3BD File

What are 3BD files and how to open them

Are you having problems opening a 3BD file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 3BD files.

What is a 3BD file?

A .3BD file is a 3D Construction Kit Brushes Data file.

3D Construction Kit Brushes Data files store the brush sets used by the 3D Construction Kit game-creation utility (Freescape engine) developed by Incentive Software. These files define reusable brush objects (pre-shaped 3D elements) that creators can place, combine or reuse when building 3D environments in the editor of 3D Construction Kit. They are part of the application's data resources rather than individual game levels.

The files are generated and used by the 3D Construction Kit editor itself. Users of the editor select brushes from these .3BD files when designing or editing a virtual world; the brush data provides shapes, geometry or predefined object components that the world-creator can insert. When a world is tested or compiled, brush definitions from these files are loaded to render the scene; the brushes are not modified by the runtime environment but are fixed sets packaged with the editor or as add-on data.

Files begin with the ASCII header "3DConstructionKitSystembrushesfile" at offset zero, which serves as a signature to identify the format. That signature marks these files as brush-definition data for the 3D Construction Kit system.

How to open 3BD files

Important: Different programs may use files with the 3BD file extension for different purposes, so unless you are sure which format your 3BD file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 16, 2026

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