Windows "Longhorn" build 4050 (with a build tag of 4050.private/lab06 demo.031019-1809) is a build of the Microsoft Windows "Longhorn" operating system. This build was shown during Microsoft's Professional Developers Conference of 2003 to demonstrate some of the new features enabled by the WinFX set of application programming interfaces (APIs).
Screenshots
4050 build tag.
About Windows dialog box in build 4050.
The Amazon.com client application and the Windows Sidebar.
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