WoW Cataclysm 4.0.1 patch: Launcher
- Red: Core setup files.
- Yellow: Very important, but not completely necessary files. These could be walls and structures. If the data isn't downloaded, you'll see a "forcefield" in-game that you are unable to pass until downloading the necessary files.
- Green: Less important files but still needed. These files could be higher detail textures and other non-critical portions.
If the necessary files aren't pre-downloaded, the game client will automatically download them as needed.
Read more details about the World of Warcraft 4.0.1 patch in my Geekend post.
Screenshots of World of Warcraft client by Wally Bahny for TechRepublic.