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.
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 |