.SMD File Extension
File Type 1Valve Studiomdl Data File
What is an SMD file?
Three-dimensional model file used by Source Engine, a game engine used to develop games such as Half-Life; stores the model in an ASCII text format; compiled into the resulting .MDL game model using Studiomdl command line utility and a .QC script.
File Type 2Sega Mega Drive ROM
.SMD File Association 2
Game ROM for a Sega Genesis video game; may be played on a PC using a Sega Genesis system emulator.