Finding Your Way in the Inventor Interface - Autodesk Inventor 2010: No Experience Required - page 36

The Drawing Tab
Notable here is the Default Drawing File Type option. Beginning with
Inventor 2008, you can create 2D drawings as native DWG fi les, which are
compatible with AutoCAD. The original IDW fi le format of Autodesk Inventor
is still a valid and reliable fi le, but the strength of having fully native 2D data
that can be shared with AutoCAD is very useful.
The Sketch Tab
Figure 1.27 shows the Sketch tab. The settings on this tab tend to be personal.
Grid lines and axes are often set differently from user to user in a company,
which is why the options are available:
FIGURE 1.27 The Sketch tab in the Application Options dialog box