Windows 10 build 15031 (rs prerelease)

Windows 10 build 15031 (rs_prerelease) is an unleaked build of Windows 10 Creators Update. It was showcased in the video "Convert BIOS / MBR to UEFI / GPT without reformatting - MBR2GPT tool" uploaded to YouTube by Microsoft Mechanics on 6 April 2017.