Windows 8 build 7700

Windows 7 build 7700 is a Post-RTM Build of Windows 7, which was jointly shared by BetaWiki Discord members lucasm and Wheatley on 25 December 2019. Prior to its public availability, screenshots of this build were released by Russian Windows news website WZor on 29 January 2010.

Changes
The power service has been given a large overhaul, with the User-mode Power Services Extension DLL one of several DLLs added in this build, persisting to this day in Windows 10 and Windows 11. Additional APIs were also added for Audio and Bluetooth services. The On-Screen Keyboard was internally updated, with some functions being separated out into. Additional error messages were added to System Restore.

This is also the first build of Windows to require SSE instruction support to boot, and is therefore the first build to be unbootable in 86Box.

Bugs

 * It is not possible to upgrade to this build due to setup being unable to copy files required for installation.