FBX SDK Programmer's Guide >

# FBX Extensions SDK

This section provides information on the FBX Extensions SDK.

## What is the FBX Extensions SDK?

The FBX Extensions SDK is a set of callback functions that you can define in a dynamically loaded library (.dll) to customize the behaviour of the FBX importing and exporting functionality of 3ds Max, Maya, and MotionBuilder.

The FBX Extensions SDK comes packaged with:

- Source code for reading and writing scenes to FBX and Collada files. This source code can be modified to extend these file formats for your own needs.
- Samples to help you read and write in a custom file format.
- Source code for sample FBX extensions to 3ds Max, Maya and MotionBuilder.

#### Topics in this section

- Installing the FBX Extensions SDK
- FBX Extensions to Maya
- FBX Extensions to 3ds Max
- FBX Extensions to MotionBuilder
- Exporting with the FBX Extensions SDK
- Importing with the FBX Extensions SDK
- Customizing File Formats