The National Archives
Search our website
  • Search our website
  • Search our records
Image of software box and CD PRONOM
Welcome (PRONOM  home page) About PRONOM Add an entry
Search Help - opens in a new window Information resources - opens in a new window

*Details: File format summary



Search by keyword Search by file format Search by PUID Search by software Search by vendor Search by lifecycles Search by Migration Pathway

Details for:

Save as... XML | CSV Printer friendly version


Name AutoCAD Drawing
Version R9
Other names DWG (R9)
Identifiers PUID:  fmt/30
MIME:  image/vnd.dwg
Family DWG
Classification Image (Vector)
Disclosure None
Description The AutoCAD Drawing format is a vector graphics format, and is the native file format of AutoDesk's AutoCAD family of products. The format is proprietary and AutoDesk does not make details of its structure public. The information contained here is derived primarily from the OpenDWG Alliance's reverse-engineered documentation of the format, and should not therefore be regarded as definitive. The basic structure of a DWG file comprises a header section, a drawing class definitions section, the drawing object data, a drawing object map, which contains the locations of all the objects in the drawing, and an image data section, which may contain a raster image of the drawing in either Windows Bitmap (BMP) or Windows Metafile (WMF) format. DWG version 9 is the version of the format associated with Release 9 of AutoCAD.
Orientation Binary
Byte order Little-endian (Intel)
Related file formats Has lower priority than Drawing Interchange File Format (ASCII) (R9)
Is previous version of AutoCAD Drawing (R10)
Is subsequent version of AutoCAD Drawing (2.6)
Technical Environment  
Released 01 Sep 1987
Supported until  
Format Risk  
Developed by None.
Supported by None.
Source Digital Preservation Department / The National Archives
Source date 11 Mar 2005
Source description  
Last updated 02 Aug 2005
Top of page Top of page
The National Archives Newsletter Icon

Send me The National Archives’ newsletter

A monthly round-up of news, blogs, offers and events.