DWG

File Format
Name	DWG
Ontology	Electronic File Formats 3D and CAD/CAM Models DWG
Extension(s)	.dwg, .dwt
MIME Type(s)	application/acad, application/x-acad, application/autocad_dwg, image/x-dwg, application/dwg, application/x-dwg, application/x-autocad, image/vnd.dwg, drawing/dwg
PRONOM	fmt/531, others

DWG (AutoCAD Drawing) is the native binary file format for AutoDesk CAD products (AutoCAD, etc.).

Identifiers

Below is a list of DWG versions as identified with PRONOM, but more research is needed. Versions numbers reference

Version / Format	Tag	Ext.	PRONOM
1.0	MC0.0	.dwg	fmt/21
1.2	AC1.2		fmt/22
1.3			fmt/23
1.4	AC1.40		fmt/24
2.0	AC1.50		fmt/25
2.1	AC2.10		fmt/26
2.2			fmt/27
2.5	AC1002		fmt/28
2.6	AC1003		fmt/29
R9	AC1004		fmt/30
R10	AC1006		fmt/31
R11/12	AC1009		fmt/32
R13	AC1012		fmt/33
R14	AC1014		fmt/34
2000-2002	AC1015		fmt/35
2004-2006	AC1018		fmt/36
2007-2009	AC1021		x-fmt/455
2010/2011/2012	AC1024		fmt/434
2013/2014/2015/2016/2017	AC1027		fmt/531
2018/2019/2020/2021	AC1032		fmt/1395
Drawing Template		.dwt	x-fmt/51

Sample files

• dexvert samples — image/dwg
• Sample files directly from AutoDesk

Resources

• Wikipedia page on DWG
• Open Design Alliance's specification on DWG
• LibreDWG, GNU source code to read/write DWG files
• AutoCAD version history
• AutoCAD 2021 Templates