Identification

• A file with a w3x file extension is known as a Warcraft III Expansion Map file. The w3x file extension serves as a marker, allowing your computer to quickly locate the file when it is needed by "Warcraft III."
  
  

Sources

• W3x files are contained in the "Warcraft 3: The Frozen Throne" expansion pack that is available for download online or for purchase from stores that sell PC games.
  
  

Function

• The w3x file contains landscape, characters and objects as well as a new map that are used to expand "Warcraft III."
  
  

Features

• W3x files can be edited and customized with a program known as Warcraft III World Editor.
  
  

Considerations

• Once you have installed the expansion pack for "Warcraft III," do not delete the w3x files as this could affect how the game works.