Hi,
Try to use Global Mapper. Very easy to work with it.
Just open your *.bil extension then export it as Raster / Image Format and use the USGS DEM extension.
Good luck.
I am GIS seeker. My field of work is aeronautics.
I'm a flight instrument procedure designer specialist and I thanks all for your efforts in keeping this forum.
I work with a very specialized software required for my field and also with ARCGIS.
Thanks again.
VC