Windows NT 3.x NT 3.1 Pre-Release

Windows NT 3.1 was the first of the Windows NT series. Sporting the same face as its consumer counterpart Windows 3.1, it was completely different under the hood. A true 32-bit native operating system, Windows NT descended from the work Microsoft did while collaborating with IBM on OS/2 after the great split, and bringing in former DEC employees like Dave Cutler, bringing a VMS influence into the system. It was followed up by Windows NT 4.0.

These builds are early pre-releases, that lead up to the final NT 3.1. They are ocasionally referred to as "NT OS/2", as the core technology was developed by Microsoft for use in future IBM OS/2 products. However, after the IBM-MS split, it became "Windows", and is branded as such.

The very first builds are visibly little more than the Win16 API and Windows 3.x GUI ported to a 32-bit system.

Product type
OS
Vendor
Microsoft
Release date
1991
Minimum CPU
386
User interface
GUI
Platform
Windows

Downloads

Download Name Version Language CPU File type File size
Microsoft Windows NT 3.1 (10-16-1991) October 1991 3.1 October 1991 Prerelease English x86-32 CD 21.99MB
Microsoft Windows NT 3.1 (3.10.239.1) (12-20-1991) SDK (ISO) 3.10.239.1 SDK Prerelease English x86-32,MIPS CD 21.84MB
Microsoft Windows NT 3.1 (3.10.297) (6-28-1992) SDK (ISO) 3.10.297 SDK Prerelease English x86-32,MIPS CD 45.24MB
Microsoft Windows NT 3.1 (3.10.328.1) (10-12-1992) SDK (ISO) 3.10.328.1 SDK Prerelease English x86-32,MIPS CD 48.35MB
Microsoft Windows NT 3.1 (3.10.340) (10-12-1992) (3.5-1.44mb) 3.10.340 Prerelease English x86-32 3½ Floppy 15.43MB
Microsoft Windows NT 3.1 (3.10.340.1) (10-12-1992) Lan Manager (3.5-1.44mb) 3.10.340.1 Lan Manager Prerelease English x86-32 3½ Floppy 15.55MB
Microsoft Windows NT 3.1 (3.10.404) (3-7-1993) (ISO) 3.10.404 Prerelease English x86-32,MIPS CD 27.76MB
Microsoft Windows NT 3.1 (3.10.438) (4-22-1993) (ISO) 3.10.438 Prerelease English x86-32,MIPS CD 40.09MB
Microsoft Windows NT 3.1 (3.10.475) (6-9-1993) (3.5-1.44mb) 3.10.475 Prerelease English x86-32 3½ Floppy 28.13MB

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