.W3Z File Extension
Warcraft 3 Saved Game
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What is a W3Z file?
A W3Z file is a mission save created by Warcraft III and the Warcraft III Frozen Throne expansion pack. It saves a player's current progress and allows the game to be loaded and continued at a later time.
Multiplayer games (such as Battle.net matches) can be saved as well. However, each user must load the saved game for the match to resume correctly.