WoW:Viewing Blizzard's WoW user interface code

Extracting FrameXML locally

• Download Blizzard's UI Customization Tool (Follow the Support Tools link on http://www.worldofwarcraft.com/ )
  • This direct link should also work.
• Run it, click the appropriate button(s)
• When it's done look in World of Warcraft/Interface/FrameXML
  • Textures are a bunch of .blp files. google for 'blp warcraft'to get an idea of what this means

Viewing FrameXML on the web

• http://wdn.wowinterface.com keeps a database of all versions of FrameXML online. You can compare different versions to each other, view the contents of specific files (in a specific interface version), or just download the entire interface as it looked for a given version. Even test server versions are available.

More

• Old instructions for extracting the files (before the release of the above tool) can be found here.