I stop used 3D max some years ago and move to maya. MD* files are original files from ID Software, there where very popular in original hudguns release years, but, like i explain on Pyccna Post, i have problems to convert files from 3D Studio to MD5. MD3 files are much more simply, it don´t need Bones to work, and the first sauer engine use MD3. I only have a Alpha Blaster hudgun that i was made for MD5 but i can not export good whit 3d studio plugins and i was testing with blender. If somebody want to update to this file type, the best would be use Blender instead max. (you can export mesh to *.obj and import on Blender).
Also Sauer suport *.obj 3D files, i recomend use this file type to static models.
About MD* files:
Also, you can search on internet about that kind of plugins:
Finally, i delete a lot and a lost of unusefull content, images, duplicate files, and other things, and final package is around 1G of material to creator, this is not a mod to use, i will not delete trash hidden files, since DS_Store and Thumbs.bd are OS trash hidden files, ask for OS Coders to make a cleaner systems :-P