Windows 10 build 9697

This pre-Technical Preview build of Windows 10 is the earliest known as of 2016-05-31. It was shown at the /BUILD/ on 2014-04-02. Much like Whistler build 2202 and Windows 7 build 7700, the kernel version is still 6.3 and there is a dispute as to whether it is a very early build of Windows 10 or a post-RTM Windows 8.1 build (despite the watermark calling it 'Windows 8.1 Enterprise'.)