A MSH file is a 3D model created by Godot Engine, a free and open source game engine used to create 2D and 3D games. It stores information about a 3D model in a proprietary format similar to the Wavefront 3D Object format. MSH files are created when a user imports an .OBJ file in Godot Engine as an object when developing a game.

You can import an OBJ file into Godot Engine using the Import 3D Mesh menu or by simply dragging and dropping it a scene, then selecting Import. Godot Engine only creates MSH files when Wavefront 3D OBJ files are imported into the project. If a .DAE, .GLTF, or .GLB model file is imported in Godot Engine, the application creates an .SCN file. NOTE: MSH files are used in version 2 of Godot Engine but were replaced by .MESH files in version 3 of the application.