Windows Longhorn build 4051

Windows Longhorn build 4051 is a Milestone 7 build of Windows Longhorn, which was given out to attendees of Microsoft's Professional Developers Conference 2003 in Los Angeles, California, held between 27 and 30 October as a cut-down release from the demo builds shown off at that conference, making it one of the only two pre-reset Longhorn builds to receive a widespread release by Microsoft, with the other being the much more popular build 4074.
This build was compiled in x86, x64 and IA-64 variants, as well as evaluation mode, and as such, it can be installed on the current date. Attempting to log onto the desktop once the timebomb has been triggered will return the user to the login screen.
==NFO files==
The following NFO files were included as part of the Unknown and WinBeta releases.
==Editions and keys==
Architecture	Key
x86 & x64 	TCP8W-T8PQJ-WWRRH-QH76C-99FBW
IA-64 	P9BT8-6HBG3-GRF29-BM92B-M973D
==Bugs and quirks==
===Shell===
Due to the absence of the Avalon framework in the x64 and IA-64 compile, the Sidebar and Explorer preview pane are not present.
===ClearType===
Most copies of this build's x86 counterpart do not have ClearType font smoothing enabled by default.
===TCP/IP stack===
The TCP/IP stack can be unstable at times.
===x64 build specifics ===
As Setup installs a barebone set of drivers by default, the x64 compile of this build suffers from major performance regressions and is subject to a number of bugs. Additionally, this build lacks a significant majority of the WoW64 compatibility layer, resulting in most x86-based applications not being able to function properly.
====Hardware Abstraction Layer bugcheck on Checked/Debug compile====
Attempting to boot the x64 checked/debug version of this build on a host device with the Hyper-V hypervisor enabled causes an exception within the Hardware Abstraction Layer's processor feature check, in turn triggering a 0x7E (SYSTEM_THREAD_EXCEPTION_NOT_HANDLED) bugcheck. This issue can be worked around by either substituting the hal.dll binary with the variant from the Free compile or by disabling Hyper-V (HypervisorLaunchType) from the host's boot configuration options.
== Gallery==
===Setup ===
WindowsLonghorn-6.0.4051-Setup.png|Autorun
4051 Setup.png|Setup
4051 ProductKey.png|Enter product key
4051 EULA.png|EULA
WindowsLonghorn-6.0.4051-Setup2.png|Select the installation type (also showing the indicator that this is a PDC build).
WindowsLonghorn-6.0.4051-Setup3.png|Clean install summary
4051 DiskPartitionin.png|Drive partitioning
4051 PCName.png|Enter computer name
WindowsLonghorn-6.0.4051-Setup4.png|Setup is copying files
2003-08-28 184426.png|Loading hardware portion
Setup hardware.png|Hardware portion
===Miscellaneous===
Longhorn40424093Boot.png|Boot screen
WindowsLonghorn-6.0.4051-Login.png|Welcome
WindowsLonghorn-6.0.4051-Login2.png|Login screen
WindowsLonghorn-6.0.4051-Autorun.png|AutoRun prompt
WindowsLonghorn-6.0.4051-DefaultStore.png|Explorer
4051 GameExplorer.png|Games
4051 Matchmaker.png|An early version of Buddy Matchmaker
WindowsLonghorn-6.0.4051-Outlook.png|Outlook Express
WindowsLonghorn-6.0.4051-Screensaver.png|Login screensaver
WindowsLonghorn-6.0.4051m7-blstartmenu.png|Blue Luna theme
WindowsLonghorn-6.0.4051m7-oglstartmenu.png|Olive Green Luna theme
WindowsLonghorn-6.0.4051m7-slstartmenu.png|Silver Luna theme
WindowsLonghorn-6.0.4051m7-wcstartmenu.png|Windows Classic theme
WindowsLonghorn-6.0.4051m7-sstartmenu.png|Slate theme
WindowsLonghorn-6.0.4051-Demo.png|Demo
SafeLonghorn.PNG|Safe to shutdown screen
===PDC 2003 discs===
PDC03 Disc 01B.jpg|Disc 1
PDC03 Disc 01A.jpg|Disc 1 (alt)
PDC03 Disc 02.jpg|Disc 2
PDC03 Disc 03.jpg|Disc 3 - Yukon CD
PDC03 Disc 04.jpg|Disc 4 - Whidbey DVD
==Notes==
Category:Windows Longhorn builds