In my game development team, we work with 3dMAX. How can I import objects from MAX to Blender with QUADS?
All objects imported as dxf, vrml or the .obj export/import script converts the quads to triangles.
You can convert quads to trias in edit mode by pressing Alt-J
WOW, THANKS! 
Hm… this is a good function, but not now for me.
We have an objectum with quad-faces (modelled in MAX). I need to import it to Blender WITH original quads.
But someshere the quads always converts to triangles… 
When I use ALT+J in Blender, the triangles are transforms to quads, but this is not the original quad-faced model. It is a distorted modell.
Problem solved. With Wings3d, I can convert 3ds to vrlm with perfect quads.