Windows Longhorn build 4083

Windows Longhorn build 4083 is a Milestone 7 build of the Microsoft Windows Longhorn operating system. Originally, only the x64 version of this build leaked on 10 November 2004. On 1 February 2020, the x86 version of this build was leaked by Grabberslasher, founder of the UX.Unleaked blog.

The x64 version of this build is a test for the use of the Preinstallation Environment under the x64 architecture. The x64 version has no default wallpapers (besides the bitmap backgrounds), which is why there is only solid colors by default. It contains the new tree wallpaper that would be used on subsequent builds.

Fixes and removed features

 * The folder creation bug from build 4074, build 4081, and build 4082 has been fixed in this build.
 * Removed unmanaged-DWM ( &  ).

Installation
As typical of builds in this build range, it tends to take a long time to install and can be unstable.

No mouse driver in WinPE
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.

WordPad
WordPad does not start, as it will display with.

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

Themes

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

Explorer

 * 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

 * Hardware and Devices folder does not open.
 * Sounds Control Panel applet is missing.
 * Task Scheduler folder from Control Panel shows a nameless folder and generic folder icon.
 * Phone and Modem Options Control Panel applet name is empty.
 * Computer Management displays script errors due to missing registry entries.
 * Device Manager has a bug and as such, you cannot update drivers. You can install drivers by using devcon from the Windows XP DDK.

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

Windows Product Activation
Windows Product Activation is missing.

Safe mode
The safe mode is completely broken and results in a blue screen of death.

Additional issues for x64 build

 * The fans will automatically run at max speed.
 * Opening Device Manager will result in huge CPU usage.

Explorer

 * Help and Support does not open.

Timebomb
It is one of the notable Longhorn builds that has a broken timebomb and can be installed on the current date.