Windows 8.1/6.3.9374.0.fbl partner out15.130329-2355

Windows 8.1 build 9374 (with a build tag of 9374.fbl_partner_out15.130329-2355) is a pre-release build of the Microsoft Windows 8.1 operating system. Portions of this build were distributed on file-sharing websites and services prior to its leak on April, 20, 2013.

Build 9374 is notable for being the first known build to identify itself as Windows 8.1. New features in this build include a Kiosk Mode (later known as "Assigned Access"), which allows users to lock Windows kiosks to a single application in order to protect against malicious activity, improved SkyDrive (later renamed as "OneDrive") integration, improved support for synchronization, new application grouping options and a visible search box in the All Apps mode of the Start screen.