In teory an ".DMD" file is a".MD2" whit LOD graphical support, but i can't found a free program to open it for import/export/editing this file type. Anyone can hep me?
The ".DMD" files used by the Doom HRP v1.0.1 from Doomsday HQ forum (or New Doom forum?) and is part of a complete model. If you want "Study" and try to open the file i can give you a one .DMD, it's the body of a Cacodemon.
md2tool converts models from md2 to dmd and dmd to md2. it's a command line tool the works in windows macosx and linux.
I suggest using it to convert the model to a md2 andthen import it into blender3d using blender3d's md2 import script