A DWG file is a database of 2D or 3D drawings created with AutoCAD, a professional
CAD program. It contains vector image data and
metadata that describes the contents of the file. DWG files are related to
.DXF files, which are ASCII versions of DWG files.
DWG files can be viewed on Windows using Autodesk's free DWG TrueView program. They may also be opened by other third-party applications that support the DWG format.