importing .dfx file into maya(.mb)

[shahrahulk]

hi guys,
this is my first post, so pls bare with me this time as i dont knw how it works here, neway cuttin the thing here i'll jump to my probelm

i wanted to import 3d model from auto cad to maya, i have given the file extension .dfx in autocad, the thing is that when i import it to maya model does get imported but it is in line format....not in polygon or nurbs, i am short of time, i can not manupulate the model in line format i need them in polygon or nurbs..so if any one can help me to sort out this probelm i will be really thankful.......what should i do should i change the format in autocad or other thing is goiin wrong pls help me out