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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.


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