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AutoCAD, developed by Autodesk, is widely used by engineers, architects, drafters, and other professionals for 2D and 3D computer-aided design of a variety of products. It is used to create 2D drawings, 3D models, animations, plans, and technical drawings.
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Package file format 
In 2000, Autodesk introduced a new file format that was developed to overcome some of the limitations of previous formats and reduce the size of drawings created in AutoCAD. The new format, the DXF-file, is a modified version of the AutoCAD DXF file format that allows storing the drawing geometry, annotation, colours, fonts, layers, linetypes, and line styles, all as separate files. In addition, it can store the data used by AutoCAD applications for producing the drawing output. DXF files provide a simple mechanism for building sophisticated AutoCAD-based applications, with improved visual output in the range of AutoCAD's native graphics tools.
In 2010, Autodesk introduced a package file format for their 2010 release of AutoCAD. Unlike earlier file formats, package files are no longer separate files with individual geometries. Instead, all objects are combined into a single file using the Package file format, which can be opened and edited with AutoCAD.
DXF file viewer
The first version of the AutoCAD DXF viewer was developed by Tamas Hajny, who was employed by Intergraph from 1992 to 2000. This initial DXF viewer was a commercial product, available for Windows only, and available in all AutoCAD versions from 1992 through 2000. The name of the viewer was DXFView (which was later changed to AutoCAD DXF Viewer or AVID).
In 2000, AVID was acquired by Avant! Software. The viewer was updated to version 1.0 in June 2001, and new features included importing DXF, DWG, and PDF files, and the ability to copy objects from the DXF/DWG or PDF file to the current drawing. In 2005, Avant! was acquired by Autodesk. In 2008, Avant! Software ceased to exist.
Starting with AutoCAD 2010, the DXF viewer includes a 2D navigation feature and the ability to show 3D models, via the import of 3D geometry from a 3D design program such as AutoCAD and DWG. However, while the 3D navigation and 3D import feature are included in the standard edition, 3D Modeler and 3D Studio are considered optional. For all AutoCAD versions beginning with 2010, the DXF viewer is integrated into the AutoCAD application.
In 2014, Autodesk released a completely new DXF viewer application
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