Windows Longhorn build 4029 (main)

Windows Longhorn build 4029 is a Milestone 5 build of Windows "Longhorn", which was leaked on 23 September 2003. This build is notable for the distinctive Pig Latin build string. This was a test of automatic data entry that would become commonplace in later builds and eventually, Vista. A Home Edition SKU of this build supposedly exists, but remains unleaked to this day.

Setup
Setup has received major uplifts compared to previous builds of Longhorn, such as build 4020. Upon booting into the Preinstallation Environment, it will refer to itself as "Windows XP Preinstallation Environment", rather than "Windows Setup". The logo, during setup, has also been removed - alongside an additional cancel button at the top right and text at the top left, mentioning about the current page of setup that the user is on. This build also uses a new product key, replacing the old CKY24 key used in earlier builds. However, some copies of this build still use the old key.

The hardware portion of setup has been updated slightly, after a long while - showing its text on the bottom, and also now stating that it is detecting hardware. Once completing the hardware portion of setup, setup will restart once again.

New features and changes

 * The login screen interface has been updated massively. It features a glass version of the Windows logo folding down to the center of the screen and then showing any login messages while doing so. It also requires Ctrl + Alt + Del to be entered anytime the system is logged out and at startup if automatic logon is not enabled. The user account screen is still slightly similar to that of build 4015 and 4020, however more options have been added and animations were also added.
 * Major updates and improvements to the Windows Explorer shell have been implemented. These new Explorer features include a new toolbar with bigger buttons, larger file previews while hovering with the mouse cursor, column level filters and batch processing of images, which allows multiple images to be rotated simultaneously.
 * The analog clock interface has been updated, removing the Longhorn symbol on the clock. However, the old clock still appears if the user upgraded from an older build.
 * Outlook Express has been updated and gained a new icon. This version of Outlook relies on WinFS, so it crashes on startup if WinFS is disabled.
 * Windows Messenger has been updated to version 5.0.
 * Parental Controls has gained an update to now allow audit logging on limited users. However, it is incomplete and trying to view logs result in an "Access is denied" error.
 * Ctrl + Alt + Del now opens a security interface instead of Task Manager. This allows the user to log off, lock the computer, shutdown the computer, and open Task Manager automatically. It also includes info about what time the user has logged onto the computer.
 * Additional view settings are included, such as Carousel and Panorama. However, only the Carousel view is accessible (in the Hardware and Devices) without registry modification.
 * The taskbar and sidebar options, upon right clicking, have been updated - including the options found on the old taskbar, and the tiles sub-menu being merged with the main context menu itself.
 * The Plex theme has received minor uplifts - such as tabs in programs such as Display Properties now having a blue outline, rather than a green outline. Also, the Tahoma font size was changed to 8 and it's no longer bold.
 * The Windows XP Luna themes fonts has changed from Arial back to Tahoma and Trebuchet MS in most places.

Pig Latin strings
This build was among the first to use the Pig Latin string, onghornLay rofessionalPay (for Longhorn Professional) onghornLay omeHay ditionEay (for Longhorn Home Edition, unleaked) or onghornLay abletTay PC ditionEay (for Longhorn Tablet PC Edition) in the desktop version string, which caused some to doubt its authenticity; however, this was part of the testing Microsoft had done to propagate the product name and version number throughout the operating system, in order to dramatically simplify the naming process. In previous versions of Windows, changing the product name or version number was a difficult task which required manually editing information in many areas of the user interface.

Bugs and quirks

 * Many drivers aren't installed by default during the hardware portion of setup and have to be installed manually.
 * Most system sounds don't work as they are pointed to the  directory instead of the   directory. Even if the registry entry is modified to point to the Media directory, the sounds often don't work for unknown reasons. This was later fixed in Windows Vista Beta 2 builds.
 * The desktop watermark isn't in bold in a clean installation due to the Pig Latin change. Upgrading from a previous build will utilize the Pig Latin buildtag in bold.
 * After accepting the EULA, the disk partitioning page of setup will crash on VMware Workstation Pro/Player version 16 or newer. You can bypass this problem by performing an upgrade or using a PE from a previous build.
 * When upgrading from build 4020 the user account that initiated the upgrade may have a password applied to the account. You can sign in with the administrator account to remove the password.

Humorous findings
The resource  in   has a few humorous comments:

; despite all the crap in here, NONE OF THIS GETS CALLED, EVER!!! ; apparently its here because devs like to manually register shellinterop. ; eventually when shellinterop does get registered, we'll go here.


 * NOTE: The following are currently replicated in shell32\selfreg.inx b'cos setup cannot regsvr ShellInterop.dll yet. ;; TODO: Need to make this more targetted to exclude audio/video types that WMP can't handle.