GameMaker project
File type: Various data file
A .gmk file is a project file created by GameMaker, a game development tool for Microsoft Windows.
It stores an editable game project and its associated resources rather than a finished game.
File type category:
Various data file
Date updated: October 16, 2026
GameMaker is used to create computer games for Microsoft Windows. A .gmk file represents a GameMaker project.
The file can contain the project's source code, settings, game data, audio data, graphics and other resources used to build the game.
The .gmk format is associated with older Windows versions of GameMaker. Newer versions use a different project structure, so the version that created the file, or a compatible older version, may be required to open it.
Open the .gmk file in GameMaker for Microsoft Windows. Use the version that created the project, or a compatible older version, if a current version does not recognize the file.
A compatible version of GameMaker may be able to open the project and save it in a newer project format.
GameMaker can also export the project as a finished playable game, although this produces a game rather than another editable .gmk file.
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