Windows Vista build 6001.16637

Windows Vista build 6001.16637 is a Service Pack 1 beta build of Windows Vista. It was shared by the Chinese community BetaWorld on 17 November 2022, alongside with Windows 98 build 1577 in Pan-European English language, Windows 8 build 9200.16456 and Windows 8.1 build 9468. Prior to its publication, this build was found by BetaWorld members WoodEar85 and LeakerLand.S on 26 July 2022.

According to BetaWorld Wiki, the Preinstallation Environment of the build was found in HP's "FREd Installer" installation package, which is suspected to be used to test PXE booting.