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These options allow viewing of a drawing in color, grayscale or black.

Display Line Weights
Select this option to display line weights in the Model Layout of a drawing.

Render Engine
Render engines are the software routines that draw images to the screen. In most cases, you will not need to change the default render engine (OpenGL) used by the program. However, some graphics cards, especially on some low-powered portables, do not fully support OpenGL. For these cases, select DirectX.

Support File Search Path
Here you can specify the directory location of support files used by a drawing. Consider using this option if a drawing is not displaying correctly, such as with incorrect fonts.

Select to change the size of toolbar icons.

Register as Default Viewer
Select this option to register the program as the default viewer for DWG and DXF files. This will enable you to view files by double-clicking their icons in Windows Explorer.