Introduction.

In a DXF file, the AutoCAD(TM) version is specified in the header section.
The DXF system variable is $ACADVER.
There are many different AutoCAD releases and patches, each one of these has a different $ACADVER value.

Table: $ACADVER version values.

ValueDescription
MC0.0Version 1.0 for DOS
AC1.2Version 1.2 for DOS
AC1.40Version 1.40 for DOS
AC1.50Version 2.05 for DOS
AC2.10Version 2.10 for DOS
AC2.21Version 2.21 for DOS
AC2.22Version 2.22 for DOS
AC1001Version 2.22 for Unix
AC1002Version 2.50 for DOS
AC1003Version 2.60 for DOS
AC1004Release 9 for DOS/OS2/Unix
AC1005Pre-release 10
AC1006Release 10 for DOS/Mac/Unix
AC1007Pre-release 11
AC1008Pre-release 11b
AC1009Release 11 for DOS/Mac/Unix, Release 12 for DOS/Mac/Unix/Windows
AC1010Pre-release 13a
AC1011Pre-release 13b
AC1012Release 13 for DOS/Mac/Unix/Windows
AC1013Pre-release 14
AC1014Release 14 codename "Sedona" and 14.01 codename "PInetop" for Windows
AC1500Pre-release 2000
AC1015AutoCAD 2000 codename "Tahoe" for Windows
AC1016AutoCAD 2000i codename "Banff" for Windows
AC1017AutoCAD 2002 codename "Kirkland" for Windows
AC402aPre-release 2004a
AC402bPre-release 2004b
AC1018AutoCAD 2004 codename "Reddeer" for Windows
AC1019AutoCAD 2005 codename "Neo" for Windows
AC1020AutoCAD 2006 codename "Rio" for Windows
AC1021AutoCAD 2007 codename "Postrio" for Windows
AC1022AutoCAD 2008 codename "Spago" for Windows
AC1023AutoCAD 2009 codename "Raptor" for Windows
AC1024AutoCAD 2010 codename "Gator" for Windows
AC1025AutoCAD 2011 codename "Hammer" for Windows and for MAC OS X "SledgeHammer"
AC1026AutoCAD 2012 codename "Ironman" for Windows, for MAC OS X "Iron Maiden", LT for MAC OS X "Ferris"
AC1027AutoCAD 2013 codename "Jaws" for Windows, LT for MAC OS X "Jaws"
AC1028AutoCAD 2014 codename "Keystone" for Windows, for MAC OS X "Sandstone", LT for MAC OS X
AC1029AutoCAD 2015 codename "Longbow" for Windows, for MAC OS X
AC1030AutoCAD 2016 codename "Maestro" for Windows, for MAC OS X "Mandalore"
AC1031AutoCAD 2017 codename "Nautilus" for Windows