.smd

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A .smd file is a file used to create a .mdl file for Half-Life 1 and 2. A .qc file is required to compile a number of smd files into a mdl file. There are a number of different types of smd file.

• Reference - what you see.
• Physics - used for collision detection.
• Animation - animation information eg. run (each animation is in a separate smd file)

This file extension is also used for Sega Mega Drive ROMs.