[FWTools] Newb problem - exporting

[Geoff Mark]

Hello.  I am new to GIS, in fact I just need to use some ADF files from 
USGS in off-the-shelf 3D software (Lightwave v9.6)  I found FWTools, 
which loads the ADF files nicely on my 64-bit Win7 machine, but does not 
export at all.  I'd prefer DEM files - actually I'd really prefer DXF or 
OBJ files.

Is there something really basic I'm not doing?

Thanks,
Geoff