Microsoft Cairo build 1175

Microsoft Cairo build 1175.1 is a late build of Microsoft Cairo, based on the core of Windows NT 4.0 build 1175.1. This build was leaked by The Distractor on BetaArchive on 17 March 2017.

It has some differences from the regular SUR build:
 * Cairo OFS (Object File System) support
 * Cairo Domains support
 * Updated Setup wizard
 * Updated login screen
 * Additional Cairo components

Installation
This build requires two partitions before starting the GUI setup, as network setup will require a partition to format to OFS. However, it might be possible to bypass this by simply selecting the drive that Windows is being installed on and selecting "N" when prompted to format the drive. If this bootloader is on an OFS drive, the build will hang on boot.

On the Primary Domain Controller dialog, you must Alt + F4 out of the window as it is impossible to get past it due to an "Unable to update local security in order to join domain" error.

Select installing Domain Controller (DC) on the Select Cairo Install Type, otherwise it will become nearly impossible to log in. Select FirstDC as the domain controller type and leave the domain and OU name as is.

More info on how to install here.

Windows Explorer
The first time you load  on each boot, you must use Ctrl + Alt + Del and log off, since each time Explorer first loads, it will hang loading. You can then log in again normally. Most functions in Explorer such as changing the background can cause Explorer to hang and force you to log out and back in again to regain control.

Build differences
The  folder contains ,   and    folders as well as compiler-output file   listing checksums for each file. This proves this build came directly from MS build servers at the time. also proves Cairo components were built seperately (to a  folder) and then copied over the base build, something that happened again with Neptune four years later.

This build contains an additional disk utility,, intended for OFS partitions. It triggers a bug in the Option ROM of the NCR 810 SCSI controller on some systems (all-caps strings warn against its use on unknown Dell systems of the era), leading to an unbootable system if used on the boot drive.