DirectX
Release history
The version number as reported by Microsoft's DxDiag tool (version 4.09.0000.0900 and higher) use the x.xx.xxxx.xxxx format for version numbers. However, the DirectX and Windows XP MSDN page claims that the registry always has been in the x.xx.xx.xxxx format.

DirectX

Section Title: Release history
Table Section Text: The version number as reported by Microsoft's DxDiag tool (version 4.09.0000.0900 and higher) use the x.xx.xxxx.xxxx format for version numbers. However, the DirectX and Windows XP MSDN page claims that the registry always has been in the x.xx.xx.xxxx format.

DirectX version	Version number	Release date	Notes

1.0	4.02.0095	September 30, 1995

2.0	1996	Was shipped only with a few 3rd party applications

2.0a	4.03.00.1096	June 5, 1996	Windows 95 OSR2 and Windows NT 4.0

3.0	4.04.00.0068	September 15, 1996

4.04.00.0069	1996	Later package of DirectX 3.0 included Direct3D 4.04.00.0069

3.0a	4.04.00.0070	December 1996	Windows NT 4.0 SP3 (and above) Last supported version of DirectX for Windows NT 4.0

3.0b	4.04.00.0070	December 1996	This was a very minor update to 3.0a that fixed a cosmetic problem with the Japanese version of Windows 95

4.0	Never launched	DirectX 4 was never released. Raymond Chen of Microsoft explained in his book, The Old New Thing, that after DirectX 3 was released, Microsoft began developing versions 4 and 5 at the same time.

5.0	4.05.00.0155 (RC55)	August 4, 1997	Available as a beta for Windows 2000 that would install on Windows NT 4.0

5.2	4.05.01.1600 (RC00)	May 5, 1998	DirectX 5.2 release for Windows 95

4.05.01.1998 (RC0)	June 25, 1998	Windows 98 exclusive

6.0	4.06.00.0318 (RC3)	August 7, 1998	Windows CE as implemented on Dreamcast

6.1	4.06.02.0436 (RC0)	February 3, 1999

6.1a	4.06.03.0518 (RC0)	May 5, 1999	Windows 98 Second Edition exclusive

7.0	4.07.00.0700 (RC1)	September 22, 1999

4.07.00.0700	February 17, 2000	Windows 2000

7.0a	4.07.00.0716 (RC0)	March 8, 2000

4.07.00.0716 (RC1)	2000

7.1	4.07.01.3000 (RC1)	September 14, 2000	Windows ME exclusive. Last version to have built-in RGB software rendering support

8.0	4.08.00.0400 (RC10)	November 12, 2000

8.0a	4.08.00.0400 (RC14)	February 5, 2001	Last supported version for Windows 95 and last version to have software rendering support in dxdiag.exe

8.1	4.08.01.0810	October 25, 2001	Windows XP, Windows XP SP1, Windows Server 2003 and Xbox exclusive

4.08.01.0881 (RC7)	November 8, 2001	This version is for the down level operating systems (Windows 98, Windows ME and Windows 2000)

8.1a	4.08.01.0901 (RC?)	2002	This release includes an update to Direct3D (D3d8.dll)

8.1b	4.08.01.0901 (RC7)	June 25, 2002	This update includes a fix to DirectShow on Windows 2000 (Quartz.dll)

8.2	4.08.02.0134 (RC0)	2002	Same as the DirectX 8.1b but includes DirectPlay 8.2

9.0	4.09.00.0900 (RC4)	December 19, 2002	Periodic updates were released for DirectX 9, starting from 4.09.00.0904 (RC0 for DX 9.0c) in October 2004, released bimonthly until August 2007, and quarterly thereafter.

9.0a	4.09.00.0901 (RC6)	March 26, 2003

9.0b	4.09.00.0902 (RC2)	August 13, 2003

9.0c	July 22, 2004	First 9.0c version and last supported version for Windows 98

4.09.00.0903	Windows XP SP2 exclusive

4.09.00.0904 (RC0)	August 4, 2004

December 8, 2006	Last supported version for Windows 98 Second Edition

4.09.00.0904	August 6, 2004 / April 21, 2008*	Xbox 360, Windows XP SP2, SP3*, Windows Server 2003 SP1 and Windows Server 2003 R2

October 27, 2008	Last supported version for Windows ME

10	6.00.6000.16386	November 30, 2006	Windows Vista exclusive

10.1	6.00.6001.18000	February 4, 2008	Windows Vista SP1, Windows Server 2008 Includes Direct3D 10.1

6.00.6002.18005	April 28, 2009	Windows Vista SP2, Windows Server 2008 SP2 Includes Direct3D 10.1

11	6.01.7600.16385	October 22, 2009	Windows 7, Windows Server 2008 R2

6.00.6002.18107	October 27, 2009	Windows Vista SP2 and Windows Server 2008 SP2, through the Platform Update for Windows Vista and Windows Server 2008

6.01.7601.17514	February 16, 2011	Windows 7 SP1, Windows Server 2008 R2 SP1

11.1	6.02.9200.16384	August 1, 2012	Windows 7 SP1, Windows 8, Windows RT, Windows Server 2012

11.2	6.03.9600.16384	October 18, 2013	Windows 8.1, Windows RT, Windows Server 2012 R2, Xbox One

12.0	10.00.10240.16384	July 29, 2015	Windows 10, Xbox One

12.0	10.00.15063.0000	March 20, 2017	Windows 10, Depth Bounds Testing and Programmable MSAA added

12.0	10.00.17763.0001	October 2, 2018	Windows 10, DirectX Raytracing support added

Sentence(s)

DirectX 11.2 is included in Windows 8.1, RT version and Windows Server 2012 R2.

final_sentence: DirectX 11.2 is included in Windows 8.1, RT version and Windows Server 2012 R2.