Windows 8 build 7700

Windows 8 build 7700 is a Milestone 1 build of Windows 8. Screenshots of this build were released by the Russian Windows news website WZor in late 2010-01. This build has been determined to be a Windows 8 build, due to its relatively high build number and presence of an extremely early version of Internet Explorer 9. Assert strings have been changed to hide the full path, like in Windows 8 and unlike Windows 7 SP1. In addition, some executables are signed by "Windows Main Build Lab Account" like later Windows 8 builds. This build reuses the betta fish default wallpaper seen in the beta/RC builds of Windows 7.

In addition, the power service has been given a large overhaul, with the User-mode Power Services Extension DLL (umpoext.dll) first being added in this build, which persists to this day.

The build was leaked by BetaWiki Discord member lucasm on 2019-12-25.

The IE9 in this build is extremely buggy and will often crash instantly when switching to IE9 mode or loading a page with HTML5 content.