Files with w3x file extension can be usually found as aps for Warcraft III computer game. Used in Frozen Throne expansion.
Software that open w3x file
W3X file extension - Blizzard Warcraft III expansion map
What is w3x file? How to open w3x files?
The w3x file extension is associated with the computer game Warcraft III RTS computer game developed and released by Blizzard.
The w3x files contain Warcraft III expansion maps, a game map or scenario created for Warcraft III: The Frozen Throne expansion pack
It includes terrain information, regions, units, and other objects that can be placed within the map. It may be included with the game or created by players using the Warcraft III World Editor.
The default software associated to open w3x file:
Warcraft III: The Frozen Throne 
Company or developer:
Blizzard Entertainment, Inc.
Warcraft III: The Frozen Throne is a real-time strategy computer game developed for Microsoft Windows, Mac OS and Mac OS X by Blizzard Entertainment and released in 2003. It is the official expansion pack to Warcraft III: Reign of Chaos.
List of recommended software applications associated to the .w3x file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open w3x file, edit w3x file, convert w3x file, view w3x file, play w3x file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with w3x file - Blizzard Warcraft III expansion map
Click on the software link for more information about Warcraft III: The Frozen Throne. Warcraft III: The Frozen Throne uses w3x file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
