Windows Longhorn build 3713

Windows Longhorn build 3713 is a Milestone 3 build of Windows Longhorn, which was uploaded to BetaArchive on 26 April 2011.

New features and changes

 * The 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 in Milestone 5 and 6 builds. This new taskbar always uses the Plex theme regardless of what theme the user selects.
 * 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 open, but it does not contain any content
 * The question mark now appears at the first page of the OOBE again.
 * The Sidebar context menu has been made lighter.
 * Windows Trust Manager opens in a larger size by default, and also refers to itself as simply "Windows Application". The overriding text bug has not been fixed.

Tablet PC
This build is currently the only leaked pre-reset build that has both the Media Center and Tablet PC components. These components would later be included in the final release of Windows Vista and do not require a separate SKU. The Tablet PC components can be installed from the Add or Remove Programs in the Control Panel. It includes On-Screen Keyboard, Sticky Notes, InkBall, Tablet PC Tutorials, and Windows Journal.

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

Bugs and quirks

 * Windows Journal does not open due to missing inking components.
 * Classic View is missing in 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 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 Category View.
 * Deleting the  key from   will enable the Windows XP tasks pane in Explorer.
 * When adjusting the resolution, the sidebar will fail to render properly, and will appear to either show a grey box, or not render at all. Restarting Explorer fixes this issue.
 * Avalon throws out errors in MyTVApp.
 * When installing this build from the RTM build of Windows XP, setup will ask if you want to convert the drive to NTFS, even if the drive is already NTFS.
 * On some graphics drivers, balloon notifications flicker when over the sidebar.
 * Clicking on  when attempting to apply a new user account picture may return a "Page not found" error.

Desktop Composition Engine
Desktop Composition Engine requires either compatible hardware or VMware Workstation 6.5.x to work (6.5x compatibility won't work), otherwise it will result in a black screen.

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