Importing into Med is a bit hairy with A6. Assuming you have some experiance with med... import your file you jsut exported from 3dsmax. Now an import window will come up and the buttons will be in german; click the left one. (dont check or uncheck any of the mesh or material blocks.

Open up yous skin window, and re apply the location of each texture file to the apropiate material.

For some reason you lose the texture location when you import, but you keep your skin mapping. Which is good, becasue MED is a pain to select anything in.

Also for skin mapping, make sure you make one in 3dsmax (16 sided). if you dont it may show up as textured in med, but when in WED and compiled it will jsut be a solid colour; like a material.

Try looking under the MED section of the forum, there are serval tutorials on how to successfully go from 3dsmax to .mdl, There might be a plugin for exporting .mdl straight from 3dsmax (I know there is one for blender)