hmm...when converting to FBX(frm max) i turned off the "Split per-vertex Normals".

Then when i imported the fbx to maya.It was still triangle.But now when i Mesh > quadrangulated the object most of it turned into quad!!!But still not all of them(file attached).

Can anyone give my any explanation? or any better pipeline to do this?

Cause there is lots of triangles still needed to be manually converted to quads!...quadrangulate is not working more then once.What can i do??

in the file.zip...both max and quad converted mb file is attached!

EVEN i tried DXF conversion.But it shows me the same result.Some of the model still remains in tries.