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.

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.

Installation
This build requires two partitions before starting the GUI setup, as network setup will require a partition to format to OFS. Attempting to install without an OFS partition may result in the setup refusing to continue or a system crash upon rebooting after the GUI setup. If the bootloader is on an OFS partition, 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.

To log into the system, use the username entered during setup as both the username and password.

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.

File differences
The following files have been introduced or removed compared to Windows NT 4.0 build 1175.1: