Windows Vista build 5112

Windows Vista build 5112 is the official Beta 1 build of Windows Vista. This build was officially released on 27 July 2005. It is one of the first Beta 1-class builds to be compiled, and certainly, the first Vista build to become widely available. At this point in development, Microsoft had decided that Windows Vista would be the final name of the operating system, hoping to boost the image and perception of the product among end users.

Jim Allchin himself expressed his feelings for the name, stating: "''Vista' creates the right imagery for the new product capabilities and inspires the imagination with all the possibilities of what can be done with Windows – making people’s passions come alive.'"

However, the name Longhorn was still used in numerous areas, such as within the About Windows dialog box, registry entry for Winlogon, and in the boot splash. This is to be expected, considering the point at which this build was compiled (it was compiled two days before the announcement of the name change to Vista). The name Vista was only mentioned in the build tag.

The Aero theme gained a slight update from 5098, featuring more distinct borders and fixed text color on some windows.

This build introduced many features that were originally planned for Longhorn, including the new networking and audio subsystems, and the .NET Framework 3.0 (still referred to as WinFX) which was nearly complete at the time this build was compiled.