Windows SDK & DDK (1986) 47 Windows DOS

The Microsoft Windows Software Development Kits (SDK) provide sample program code, extra libraries, and documentation to aid application developers producing Windows applications. Microsoft Windows Driver Development Kits are similar sets of samples and libraries but specific to device driver development, and much more in-depth.

• Windows 1.x
• Windows 2.x
• Windows 3.0
• NT 3.x
• Windows 3.1
• WfW 3.11
• Windows 95
• NT 4.0
• XP (NT 5.1)
• 2003 (NT 5.2)

Windows Whistler (1999) 170 Windows

Windows Whistler was the pre-release codename for Windows XP, or NT 5.1. It is the successor to Windows 2000. XP was the first that did not compete against a DOS based version of Windows, effectively finally unifying the Windows line in to a single pure 32-bit product. Below are various Beta releases. Winworld does not host the final RTM versions.

• Early Whistler
• Beta 2

Workgroup Add-On (1994) 6 DOS

The Microsoft Workgroup Add-On for MS-DOS is the easy way to connect users of MS-DOS to networks based on Microsoft windows. Now you can share documents, messages, and printers among PCs running MS-DOS and connect to Windows-based PCs too. It could be just what you need to make the most of older PCs and start networking.

• 1.x