Microsoft Windows 8.1, 6.3.9374.0

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Notes

This build was first released as an boot.wim and a small portion of the System32 files only.
It was later leaked as a full build.

New and/or Updated features:
- New Search Pane is now default and has been updated
- All Apps button has been updated
- Kiosk Mode, to set Windows to use only a single App
- Windows 8 Pro has been changed to Windows 8.1 Pro Preview
- Use feeds for Lock screen Slideshow
- FingerprintPassword

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Hash

MD5: 0FA9AB7CBC4722DB0FF9B31E79F5B548

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Fixes

Use feeds for Lockscreen Slideshow
Run the following registry (.reg) script:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Lock Screen]
"SlideshowDebug"=dword:00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Lock Screen\FeedManager]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Lock Screen\FeedManager\Feeds]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Lock Screen\FeedManager\Feeds\{FE6B11C3-C72E-4061-86C6-9D163121F229}]
"URI"="http://themeserver.microsoft.com/default.aspx?p=Bing&c=Desktop&m=en-US"
@="(value not set)"

Then open PC Settings, on the LockScreen tab, enable the Picture Frame.
Set the source to the white one instead of skydrive, wait a few minutes to let Windows create the feed and download images.
The "SlideshowDebug" is only needed if you want the Debug screen on the Slideshow.