Windows Longhorn build 4093

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Build of Windows Longhorn
OS family
Timebomb2005-02-16 (+181 days)
Works in
LH4093 Winver.png
TCB.png TCBGallery.png

Windows "Longhorn" build 4093, with a build tag of 4093.main.040819-1215, is the last winmain compile of the original "Longhorn" project (based on the Server 2003 RC1 code-base) before development was reset. It was leaked on 2006-08-28, shortly after the closure of the original OSBetaArchive, and was labelled a farewell release. This build is highly unstable; which was typical of most later "Longhorn" builds.

It was the last pre-reset "Longhorn" build to be leaked, and one of the last to be compiled. This build's installation media cannot be booted up normally; this can be done using build 4033's Preinstallation Environment, and even then installation does take a long time to complete.

Many applications and features are unstable works-in-progress, and might not function as intended. However, most working features and applications can be launched using the Run command and certain features like Wordpad and Windows Classic theme has been fixed. The development reset occurred at 9 pm the same day this build was compiled and development moved to a new code base, which eventually became Windows Vista.

This is the last client build that does not require ACPI to work since it uses NTLDR. Later post-reset builds after 3790 require ACPI to operate since they use BOOTMGR instead.


  • Safe mode is broken and displays a BSOD.
  • CD and DVD drives behave like local disks.
  • Help and Support causes an explorer.exe restart.
  • Explorer can randomly crash for no reason under normal use.


This build still includes the tree wallpaper used in build 4084 and build 4088, which is not entirely unexpected, considering this is among the last pre-reset builds compiled.

Avalon Applications[edit]

It includes an Avalon-based Windows Movie Maker application. However, this version is highly unstable, and the debug prompts and error messages that plague it make it nearly unusable. This build also marks the return of the Avalon-based Display Properties dialog first seen in build 3683. However, it is highly unstable, and most of the links simply redirect you back to the XP-style dialog. An Avalon-based Power dialog can be found in this build as well, though, like the Display Properties, it is unstable.


This build is the last build to include the original Sidebar. It would be reintegrated into Vista, but only starting in build 5212 and as its own process instead of being intergated with explorer.exe. This build is also among the last to include WinFS.


External links[edit]