Main Page

Welcome to BetaWiki!

An open encyclopedia of software history

Did you know...

Featured article

Windows 8.1 build 9354 (winmain) is an internal development build of Windows 8.1, which was found on a formerly Microsoft-owned Samsung Ativ Tab prototype (part number WGPV3).

The original WIM images of this build were first uploaded onto the Internet Archive in January 2024, followed a few days later by a full dump of the prototype's eMMC storage. Compared to the WIM images, the eMMC dump also includes internal tools such as debuggers, test suites and other development tools.

The build includes a large array of user interface reworks, as well as incremental quality-of-life changes to existing operating system functionality and the removal of several legacy features.

News

Latest released builds

iOS 17.4

macOS Sonoma 14.4

Windows 10 Release Preview (2022 Update)

Windows 10 Team vNext

Windows 11 Beta (2023 Update Moment 5)

Windows 11 Dev (2024 Update)

Windows 11 Canary (2024 Update)

Windows Server 2025

Recently shared builds

OS/2 2.0

Windows 95

Windows Server 2008

Windows 7

Windows Server 2008 R2

Windows Small Business Server 2011

Windows 8

Windows Embedded 8

Xbox OS

Windows 8.1

Windows 10 Fast Ring (May 2020 Update)

Windows 11 Canary (Gallium)

Windows Server 2025 (Germanium)