Blizzard officially replaced the original client with . While the launch was controversial, it remains the official way to play online via Battle.net. However, if you have your original CD keys from 2002, you can often still register them to your Blizzard account to access the game [5].
Here's a detailed story about the game:
Follow the tragic fall of Prince Arthas and the diverse perspectives of the Humans, Orcs, Undead, and Night Elves. The World Editor: Warcraft III Reign Of Chaos Skidrow Reloaded
