BetaWiki:Featured article/2019-09
Windows Vista build 5048 (with a build tag of 5048.winmain idx02.050401-0536) is the first Omega-13 build of Windows Vista to leak after the development reset of Windows Longhorn. It was released to attendants of WinHEC 2005, and was known as the "Longhorn Developer Preview". It calls itself Beta 1 in the setup handle but is not the true Beta 1.
The Jade and Slate themes are no longer included, and the Aero theme is now the default, along with its visual effects. Many of the icons from later pre-reset builds have returned, albeit with minor alterations. A few icons are also new to this build. However, the Control Panel and Printers icons are from Windows 95.