Chapter 7: Page 119 - 'Exploring Blizzard's XML User Interface Customization Tool'

Blizzard no longer provides an external tool to extract the interface data and art, but this has been integrated into the client. To access this, you will need to start the client with the -console switch.

For Windows:

Run wow.exe -console.

For Mac OS X:

Run open 'World of Warcraft.app' --args -console.

Once the client is loaded, you can use the ~ key to open the console. You can then extract the interface data or art with the following commands:

The files will be extracted into the WoW directory.