Windows Longhorn build 4081

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6.0.4081.main.040503-1625
Build of Windows Longhorn
6.0.4081.main.040503-1625
OS family
Architecturex86
Compiled2004-05-03
Timebomb2004-10-30 (+180 days)
Works in
About
Longhorn4081Winver.png
SKUs
Professional
Key
TCP8W-T8PQJ-WWRRH-QH76C-99FBW
TCB.png

Windows Longhorn build 4081 is a Milestone 7 build of Windows Longhorn. On 23 January 2020, this build was listed in a BetaArchive thread by UX.Unleaked blog founder Grabberslasher. This build was released on 27 January 2020 in the fourth set of his 33 Longhorn/Vista builds along with build 5098.[1]

Changes[edit | edit source]

  • This build is very similar to 4074, but it is the first componentized build of Longhorn, meaning many core features from previous builds have been removed and introduced several bugs. These features were scheduled to be added in subsequent versions of the operating system, leaving what remains the bare minimum to run the system.

Setup[edit | edit source]

Setup is very similar to the previous build of Windows Longhorn, but with a bit updated Setup UI.

Bugs[edit | edit source]

Installation[edit | edit source]

As typical for componentized builds, it tends to take a long time to install and can be unstable.

No mouse driver in WinPE[edit | edit source]

On some computers and virtualizers, the WinPE doesn't support the mouse, so you must use the keyboard to navigate the WinPE. This seems to be related to using a PS/2 mouse, as USB mice seems to work fine for the setup.

Upgrade[edit | edit source]

Attempting to upgrade from other builds is not possible, causing either of these 2 things:

  1. A bugcheck with error code 0x7E after the second reboot. This is commonly observed when trying to upgrade from non-componentized builds, such as 4074 (via a registry tweak that reports it as a componentized build).
  2. An error while copying files.

WordPad[edit | edit source]

WordPad does not start, as it will display with Failed to create empty document instead.

Outlook Express[edit | edit source]

Outlook Express does not start due to registry errors and certain dependencies on WinFS.

Themes[edit | edit source]

  • The Windows Classic theme will not function due to a broken Windows Classic.theme file.

Explorer[edit | edit source]

  • CD and DVD drives behave like local disks.
  • Help and Support crashes Explorer.
  • Explorer can randomly crash for no reason under normal use, such as adding Sidebar tiles, but this depends on the hardware being used.

Control Panel[edit | edit source]

  • Hardware and Devices folder does not open.
  • By default, sounds Control Panel applet is missing. It is possible to port mmsys.cpl from another build to the WINDOWS\SYSTEM32 directory in order to get the control panel applet to work.
  • Task Scheduler from Control Panel shows a nameless folder and generic folder icon.
  • By default, the Phone and Modem Options Control Panel applet name is empty and can be fixed by porting telephon.cpl from another build (prior to the later componentized builds of Windows Longhorn) to the WINDOWS\SYSTEM32 directory in order to make the control panel applet to work.
  • Computer Management displays script errors due to missing registry entries.
  • Device Manager has a bug that drivers can't be updated due to the Hardware Wizard Control Panel applet is missing. You can install drivers by using devcon utility from the Windows XP Driver Development Kit (DDK), or copy the hdwwiz.cpl from another build to the WINDOWS\SYSTEM32 directory in order to get the updating drivers via Device Manager to work.

Creating folders[edit | edit source]

The folder creation bug from build 4074 is still present in this build. Apply the following registry key to fix it:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\.Folder]
@="Folder"

DirectX[edit | edit source]

Although the Desktop Window Manager is present and can be activated by pressing Ctrl+Shift+F9 as in Windows Server 2008 build 4066, it will result in a black screen and close due to a broken DirectX installation. It can fixed via the instructions listed on the Windows Aero page.

Graphics[edit | edit source]

Enable VGA Mode after installing video drivers or the system will result in a blue screen of death with an error code of 0x000000B4.

Windows Product Activation[edit | edit source]

Windows Product Activation is missing.

Safe mode[edit | edit source]

The safe mode is completely broken and results in a BSOD.

Gallery[edit | edit source]

References[edit | edit source]