TrustedDWGâ„¢ Drawing Files

DWG, DWT, and DWS files created with Autodesk applications and RealDWGâ„¢-based applications are trusted by Autodesk.
When you open a TrustedDWG file, the following icon displays in the status bar.

If the DWGCHECK system variable is set to On (1), an alert box is displayed if

• The drawing file format is AutoCAD Release 14 or later and
• The drawing file was not originally created by an Autodesk application or RealDWG-based application.

For more information about TrustedDWG, click the TrustedDWG icon.

Change the Default Drawing Folder

Each time you start the product, the last folder used, for opening or saving a file,
is the default path in the standard file selection dialog box.

You can specify your own default folder.

Resolve Missing References

When you open a drawing, you are notified when a reference cannot be located. From
the References – Unresolved Reference Files task dialog box, click Update the Location
of the Referenced Files to open the External References palette to make changes to
missing external references.

The following table outlines some of the references that might be missing and describes
how to handle them.

You can use eTransmit to avoid missing files when sharing drawings with others outside
of your company.

Work on Drawings During Loading (not available in AutoCAD LT)

You can work on drawings before they are fully open. This is useful when you work
on large drawings and you want to begin working immediately. To take advantage of
this capability, the following conditions must be satisfied.

• The drawing must have been saved in paper space.
• The OPENPARTIAL system variable must be set to 1.
• The INDEXCTL system variable must be set to a non-zero value.

When these conditions are met, you can create or modify visible objects, pan or zoom,
turn off or freeze layers, and any other operation that does not require displaying
objects not visible when the drawing was last saved.

Work with Large Objects

Beginning with the AutoCAD 2010 drawing file format, drawing files can support object
sizes greater than those available in previous releases. With increased object size
limits you can create larger and more complex models. Using increased object size
limits can result in compatibility issues with legacy AutoCAD 2007 and earlier drawing
file formats.

When working with drawings that you might need to exchange with others using AutoCAD
2009-based products and earlier, set the LARGEOBJECTSUPPORT system variable to 0.
This system variable setting warns you when a drawing contains large objects that
cannot be opened by products predating the AutoCAD 2010 release.

Recover Defective Drawing Files

In some circumstances, it is possible that a drawing file becomes defective. This
can result from hardware problems or transmission errors. If a drawing file is corrupt,
you might be able to recover it.