Windows Longhorn build 4050 (private/lab06_demo.031022-1934)

Build of Windows Longhorn
OS familyWindows NT
Version number6.0
Build number4050
Build labprivate/lab06_demo
Compiled on2003-10-22

Windows Longhorn build 4050 (private/lab06_demo.031022-1934) is a private build of Windows Longhorn. This build was shown during the PDC 2003 conference and is known to have Aurora and Aero transparency. During the demonstration, Hillel Cooperman showed the new Aero transparency, which more than 40 people worked on for over a month,[1] and also opened a MS-DOS application to prove that this was not a concept but a real build. A copyright notice at the bottom left of this build can be seen, stating the following:

©, ™ Microsoft Corp. All rights reserved. User interface is ™ and trade dress of Microsoft Corp.

On 27 September 2018, ReflectiaX claimed to have a copy of this build on the BetaArchive forum.[2]

In a screenshot, another build running in a window can be seen at the bottom right corner, likely run through Remote Desktop.

Gallery[edit | edit source]

References[edit | edit source]