Drawing format version codes for AutoCAD
MC0.0 - DWG Release 1.1
AC1.2 - DWG Release 1.2
AC1.4 - DWG Release 1.4
AC1.50 - DWG Release 2.0
AC2.10 - DWG Release 2.10
AC1002 - DWG Release 2.5
AC1003 - DWG Release 2.6
AC1004 - DWG Release 9
AC1006 - DWG Release 10
AC1009 - DWG Release 11/12 (LT R1/R2)
AC1012 - DWG Release 13 (LT95)
AC1014 - DWG Release 14, 14.01 (LT97/LT98)
AC1015 - DWG AutoCAD 2000/2000i/2002
AC1018 - DWG AutoCAD 2004/2005/2006
AC1021 - DWG AutoCAD 2007/2008/2009
AC1024 - DWG AutoCAD 2010/2011/2012
AC1027 - DWG AutoCAD 2013/2014/2015/2016/2017
AC1032 - DWG AutoCAD 2018/2019/2020
//以下为编程使用时的版本
kDHL_1002 AutoCAD 2.5
kDHL_1003 AutoCAD 2.6
kDHL_1004 第9版
kDHL_1006 第10版
kDHL_1009 R11和R12
kDHL_1012 R13
kDHL_1013 R14中期版。
kDHL_1014 R14最终版
kDHL_1500 2000年的发展
kDHL_1015 2000年最终版
kDHL_1800a 2004年中期版
kDHL_1800 2004年决赛
kDHL_2100a 2007年发展
kDHL_1021 2007年决赛
kDHL_2400a 2010年发展
kDHL_1024 2010年决赛
kDHL_2700a 2013年发展
kDHL_1027 2013年决赛。
kDHL_Newest kDHL_1027
kDHL_CURRENT kDHL_Newest
Versions of AutoCAD
DWG Versions
AutoDesk does not change the AutoCAD Drawing File Format nearly as frequently as it releases new versions, at least recently. In the early days the DWG file format was changing with pretty much every release, but while the format change for AutoCAD 2013, it did not change again until AutoCAD 2018, despite yearly releases of the program. So, the same file format was used for AutoCAD 2013, AutoCAD 2014, AutoCAD 2015, AutoCAD 2016 and AutoCAD 2017. Similarly, the format is identical for AutoCAD 2018, AutoCAD 2019 and AutoCAD 2020.
It is easy to decipher what version of AutoCAD created a given drawing file. Open the file in a text editor and look at the first six bytes (five in very early files) and match them to the following list. For DXF files this tag is given by the $ACADVER variable in the header. For instance, if the first five bytes are AC1.2 then it was created by the ancient (April 1983, so more than 35 years ago) AutoCAD Version 1.2 (or maybe AutoCAD Version 1.3, things get a little spotty back that far). If the first six bytes are AC1009 then it was created by either AutoCAD Release 11 or AutoCAD Release 12 as they shared the same format version.
If the DWG Tag value is bold in the table that means the file format changed for that version. Otherwise the file format stayed the same as in the previous version.
BTW: AutoXChange 2022 can support any version of DWG and DXF back to AutoCAD 2.5. The format changed greatly at that point and we know of no programs that support older formats. However, that was June of 1986, so the likelihood of seeing a 33+ year old AutoCAD Version 2.22 or before file is remote at best.
Name | DWG tag | Release Date |
---|---|---|
AutoCAD Version 1.0 | MC0.0 | December 1982 |
AutoCAD Version 1.2 | AC1.2 | April 1983 |
AutoCAD Version 1.3 | August 1983 | |
AutoCAD Version 1.4 | AC1.40 | October 1983 |
AutoCAD Version 2.0 | October 1984 | |
AutoCAD Version 2.05 | AC1.50 | |
AutoCAD Version 2.1 | AC2.10 | May 1985 |
AutoCAD Version 2.21 | AC2.21 | |
AutoCAD Version 2.22 | AC2.22 | |
AC1001 | ||
AutoCAD Version 2.5 | AC1002 | June 1986 |
AutoCAD Version 2.6 | AC1002 | April 1987 |
AutoCAD Release 9 | AC1004 | September 1987 |
AutoCAD Release 10 | AC1006 | October 1988 |
AutoCAD Release 11 | AC1009 | October 1990 |
AutoCAD Release 12 | AC1009 | June 1992 |
AutoCAD Release 13 | AC1012 | November 1994 |
AutoCAD Release 14 | AC1014 | February 1997 |
AutoCAD 2000 | AC1015 | March 1999 |
AutoCAD 2000i | AC1015 | July 2000 |
AutoCAD 2002 | AC1015 | June 2001 |
AutoCAD 2004 | AC1018 | March 2003 |
AutoCAD 2005 | AC1018 | March 2004 |
AutoCAD 2006 | AC1018 | March 2005 |
AutoCAD 2007 | AC1021 | March 2006 |
AutoCAD 2008 | AC1021 | March 2007 |
AutoCAD 2009 | AC1021 | March 2008 |
AutoCAD 2010 | AC1024 | March 2009 |
AutoCAD 2011 | AC1024 | March 2010 |
AutoCAD 2012 | AC1024 | March 2011 |
AutoCAD 2013 | AC1027 | March 2012 |
AutoCAD 2014 | AC1027 | March 2013 |
AutoCAD 2015 | AC1027 | March 2014 |
AutoCAD 2016 | AC1027 | March 2015 |
AutoCAD 2017 | AC1027 | March 2016 |
AutoCAD 2018 | AC1032 | March 2017 |
AutoCAD 2019 | AC1032 | March 2018 |
AutoCAD 2020 | AC1032 | March 2019 |
AutoCAD 2021 | AC1032 | March 2020 |
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