Windows 8 build 7973 (fbl core2 sid data)

Windows 8 build 7973 (fbl core2 sid data) is a build of Windows 8, which was leaked on 19 September 2015 only as an x64 checked/debug version.

Redpill
A tool named Redlock can be used to unlock all of the Redpill levels on this build, including the Start screen.

The Metro in this build is identical to its alternate compiles. However, MS Help has been removed.

Aero
This build appears to have a slightly broken Windows Aero theme, with only the top portion of the window frame using the blur effect, leaving the side borders transparent.