Windows NT 3.1 HAL-PC 1993 build

Windows NT 3.1 "NT vs OS/2 shootout" build is an unknown pre-release build of Windows NT 3.1. It was shown during the 4 June 1993 NT vs OS/2 shootout at a HAL-PC event.

Many new features of Windows NT were demonstrated, including advanced multitasking, the new NTFS file system, network printing, control panel and others. One notable difference from any other leaked build is the different Command Prompt icon in the main program group - instead of the usual MS-DOS logo, it's the  icon.

There is no visible build number in the video, nor is the version that was demonstrated ever referred to as a pre-release version. However, the RTM build 511.1 was compiled on 24 July 1993, so the version shown at the event is definitely a pre-release build. Since the event took place several days before the June beta build 475.1 was compiled, the build must be earlier than that as well.