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SMD file extension is used for text files storing 3D model data. SMD files are used by game engine GoldSrc and its successor Source Engine. SMD file is not a 3D image file – SMD file must be compiled in order to use the stored image. Studiomdl tool is used for compiling SMD files. Compilled SMD file uses MDL file extension.
SMD files along with Source game engine were used for developing many popular computer games, for example, Half-Life or Quake. SMX format is the successor of SMD format.