hlmv wont load 90% of downloaded models

forgive my ignorance but I have downloaded many gmod css hl2 models etc. None appear to load in hlmv, I have placed them in every location suggested to no avail. The models do not appear in hammer when i load them in there either, nor do they appear in game (alien swarm).

the difference i noted was that the alien swarm models do not have xxxdx80.vtx and xxxdx90.vtx and xxxsw.vtx. It appears that any models releasses including these dx8 and 9 and software modes will not work in alien swarm or even the half life model viewer any hints?