The default filename extension for AutoCAD files is .dwg.
The .dwg file format is the proprietary native file format used by Autodesk's AutoCAD software, which is a widely used computer-assisted design (CAD) package. As stated in the reference, DWG is the proprietary native file format for AutoCAD, one of the most popular computer-assisted design (CAD) packages. This means that when you save a drawing in AutoCAD without specifying a different format, it will automatically be saved with a .dwg extension.
Understanding the .dwg Format
The .dwg extension is synonymous with AutoCAD drawing files. It contains all the data that makes up a CAD drawing, including:
- Geometric data (lines, arcs, circles, etc.)
- Object properties (layers, colors, lineweights)
- Annotations (text, dimensions)
- Block definitions
- External references (xrefs)
- Layouts and viewports
Why is .dwg Important?
Understanding the .dwg extension is crucial for anyone working with AutoCAD or other CAD software that supports this format.
- Interoperability: While primarily associated with AutoCAD, many other CAD programs can read and write
.dwgfiles, making it a standard for exchanging design data. - History: The format has evolved over many versions of AutoCAD, and compatibility between different
.dwgversions can sometimes be a consideration. - Industry Standard: It's the most common file type used in architecture, engineering, construction (AEC), and manufacturing industries for 2D and 3D design data.
Here's a quick look at common AutoCAD-related file extensions:
| Extension | Description | Default? |
|---|---|---|
.dwg |
AutoCAD Drawing File | Yes |
.dwt |
AutoCAD Drawing Template File | No |
.dws |
AutoCAD Standards File | No |
.dxf |
Drawing Exchange Format | No |
When you create or save a new drawing in AutoCAD, the software automatically appends the .dwg extension to your chosen filename, ensuring it's recognized as an AutoCAD drawing file.
