Windows NT 3.51

Windows NT 3.5 Windows NT 3.51 Windows NT 4.0 Windows 2000 Windows XP Windows Server 2003 Windows XP Professional x64 Windows Vista Windows Server 2008 Windows 7 Windows Server 2008 R2 Windows 8 Windows Phone 8 Windows RT Windows Server 2012

Windows NT 3.51 is an operating system from Microsoft. It represents a technical evolution of Windows NT 3.5 represents the system APIs have been enhanced and thus support newer 32- bit applications.


The previous operating system Windows NT 3.5 was originally intended to also provide support for the PowerPC architecture. This lack, however, since IBM had to postpone delivery of the PowerPC processors repeated. Then, Microsoft decided that PowerPC support is not for NT nachzuliefern 3.5, as was done with the Alpha AXP version of Windows NT 3.1, but this issue as part of a revised version of Windows NT 3.5 under the name Windows NT 3.51.

The operating system was first announced in February 1995. The final version of NT 3.51 was released in May 1995 in the USA. End of Support was for end December 31, 2000, for corporate customers on 31 December 2001. There was then no security updates for newly discovered vulnerabilities more.

There were a total of five service packs published:

After Service Pack 5, some individual hotfixes have been posted yet. These concerned about support for the Euro symbol and AGP graphics cards.


The main innovation in Windows NT 3.51 is support for the PowerPC processor architecture as the fourth. The other innovations of Windows NT 3.51 over its predecessor 3.5 are limited. For example, PCMCIA devices are supported. If the system is installed on an Intel Pentium FDIV bug, Windows NT 3.51 provides the shutdown of the coprocessor in order to circumvent the problem.

For the NTFS file system, data compression has been introduced which allows to compress individual files or entire directories, but this comes at the expense of performance.

However, the biggest change is the addition of numerous APIs in his time in development Windows 95, so that Windows 95 programs 3:51 can be run in most cases, on Windows NT, if they are not based on Windows NT incompatible components ( such as DirectX ). Windows NT 3.51 contains the last time a driver for the HPFS file system of OS / 2, although unlike Windows NT 3.5 no more partitions can be formatted with the HPFS file system.

In preparation for Windows NT 4.0, Microsoft offered the user interface of Windows 95 as a download for Windows NT 3.51. This was indeed originally intended for developers to adapt their software to the new user interface, but was also used by many end users.

Included with Windows NT 3.51 are in addition to a CD -ROM and three 5.25 " boot disks still a 3.5 " disk set consisting of 23 disks for the Workstation and 42 disks to the server.


Minimum requirement

  • Processor: Intel 386 DX ( or compatible ) 25 MHz or MIPS R4000 / Digital Alpha AXP / PowerPC
  • 12 MB RAM ( Intel)
  • 90 MB hard disk space ( with all the updates and NTFS more)
  • Depending on the type of installation floppy or CD-Rom drive ( installation with a suitable boot CD (eg Windows 98) without floppy drive available)
  • VGA graphics card or better
  • Mouse and keyboard


  • 486 DX / Pentium 66 MHz
  • > 24 MB RAM
  • 250 MB hard disk space ( plus space for applications)
  • CD drive ( burner or DVD drive is not directly supported, possibly with foreign drivers? )
  • SVGA graphics card

Today's importance of the operating system

The importance of Windows NT 3.51 today does not go beyond the museum significance. It was in favor of later Windows versions not developed, so the system is now obsolete. Even for hardware manufacturers was the driver extension of the system ( USB, Firewire, scanner support, FAT32 drivers etc. ) through proprietary software, as later with NT 4.0, not attractive, because at that time already had follow-up systems on the market. The most popular standard programs can not be executed, the latest among NT 3.51 running Office, Microsoft Office 97 Today's peripherals such as printers, scanners, etc. are also inadequately supported or not with standard drivers. The productive use of the operating system is no longer possible on modern systems.

References and sources