OOPS. I also should have added. For the NEW R2004 DWG
format you will need to purchase the VoloView 3 product
For DWG formats prior to R2004 you can get by with the
FREE VoloView Express 2.01 product.
There is also a Classic R14 style DWF file that VoloView
Express 2.01 can also view. This R14 style DWF generator
is loaded as a Print/Plot Driver. Lots of information to
research if you are inclined.