Hi,
a complex way is to convert the results into shape files and convert the shape files to dxf. But then, you do not have the nicely looking shaded contours but only the elemental values and element geometry.
A second way is to convert the dfsu to dfs2 and convert those into usable raster files.
Unfortunately, there is no possibility to export the shaded contours data - as I know.
You can export the results as BMP, but it is not georeferenced.
We, SPEKTER, have developed an approach to export the shaded contours as nodal data. Those nodal data were further processed to whatever format you want.
So, if you are interested in this, you can contact me via e-Mail.
Bests Christian