Windows Longhorn build 3713

Windows Longhorn build 3713 is a Milestone 3 build of Windows Longhorn. This build was leaked to BetaArchive on 26 April 2011.

New features

 * The Windows Sidebar is now enabled by default.
 * Windows Media Player has been updated to version 9.
 * This build introduces the "new taskbar", which was later used as the default one in Milestone 5 & 6. This new taskbar overrides the current theme that the former taskbar had.
 * The Media Center application has been fixed and can now open, although it still often crashes upon use.
 * Download Manager no longer causes the Explorer window to hang when it is open, but there is no contents when it is opened.
 * OOBE now has the question mark animation once again.
 * The Sidebar context menu is much more lighter
 * Windows Trust Manager is now in a larger size upon opening, and also refers to itself as simply "Windows Application". The overriding text, however, hasn't been fixed.

Tablet PC
This build is currently the only leaked pre-reset build that has both the Media Center Edition & the Tablet PC edition components. These combinations would be later seen in Windows Vista in the Ultimate SKU. The Tablet PC components can be installed from the Add or Remove Programs in the Control Panel. It includes the On-Screen Keyboard, Sticky Notes, InkBall, Tablet PC Tutorials, and Windows Journal.

When prompted for the second disc, it should be pointed to the D:\I386 directory of the installation media.

Bugs and quirks

 * Windows Journal does not open due to missing inking components.
 * Classic View is missing in the Control Panel and many applets are missing. Some of the Control Panel applets can be run by running their executable from Run or Command Prompt. However, if the user upgrades from a previous build and its Control Panel was on Classic View prior to the installation, then the Control Panel can be viewed in Classic View, but the user then cannot switch back to Default View.
 * Upon setting the resolution, the sidebar will fail to render properly, and will appear to either show a grey box, or just not render at all.
 * Avalon may throw out errors in MyTVApp.

Desktop Composition Engine
Desktop Composition Engine requires either compatible hardware or VMware Workstation 6.5.x to work (just 6.5x compatibility won't work), otherwise it will result in a black screen that can only be exited by a hard reset.

File differences
The following files have been introduced or removed compared to build 3706 Professional: