Windows Longhorn build 4051

Windows "Longhorn" build 4051 (with a build tag of 4051.idx02.031001-1340) is a Milestone 7 build of the Microsoft Windows "Longhorn" operating system and is also the build given to attendees of Professional Developers Conference of 2003. It leaked on 2003-10-20.

This Milestone 7 build was distributed at PDC 2003 in Los Angeles, California. This build, for its Professional version, has a 32-bit and a 64-bit version. The 64-bit version is not overly different from the 32-bit version, but it has a new setup style and several apps including IE 6 have been optimized for 64-bit (often, the 32-bit ones do not run)

The Check/Debug version was not known to run; it will simply refuse to copy files. However, BetaArchive Discord user WindowsNeptune found a fix to the x64 version, by changing the "/nodebug" tag in the txtsetup.sif to "/debug" and installing on an AMD machine.

Features

 * The setup is updated to a Slate interface. Likewise, the login screen has been updated to have a black background and the Winver banner has been updated.
 * Documents and Photos and Videos libraries.
 * The prefix "My" was dropped, resulting in new names for locations Computer, Network Places and Contacts.
 * If the Windows Sidebar is enabled in the 32-bit version, the word "Start" is removed from the Start button (similar to later builds of Windows Vista). The x64 version lacks the sidebar completely.
 * Internet Explorer 6.05 included an add-on manager, a download manager, pop-up blocker, and a tool to quickly delete browsing history.
 * Only the basic sidebar tiles are included: Classic Tray, Clock, Quick Launch, Slide Show and Sync.
 * A new TCPI/IP stack. This has a few bugs, however, which were fixed in build 4053. Ipv6 is also enabled by default in this new stack.