Windows 10 build 10240 (winmain prs)

Windows 10 build 10240 (winmain prs) is a build of Windows 10. An image of the "About Windows" dialog has been shown, but it is unknown if this build is real. However, this build might be fake as it uses the Windows branding from builds 9821 - 10166 instead of the Windows 10 branding in build 10176.