RTM: Windows 8 RTM includes one further update:
Windows 7: These updates to the rating systems apply to Windows 7 as well when KB2773072 has been installed. PEGI (Finland) and OFLC (Australia) are present after the update, but are marked deprecated in the UI as end-users are encouraged to switch to the newer systems.
The DirectX SDK has historically been the shipping vehicle for the various Game Explorer tools. With the transition to the Windows SDK (see Where is the DirectX SDK?), these tools now have new homes:
Game Definition File Editor (GDFMaker.EXE) is in the Windows 8.0 SDK (included with Visual Studio 2012 RC and available standalone). It is located in the x86 directory under the bin folder. This version of the tool uses the ratings systems descriptions available on the version of Windows it is run on, rather than including a local copy as the older DirectX SDK version did. This means you should run it on Windows 8 be able to populate all the latest ratings information, although the tool can be run on Windows 7 as well only showing the rating systems available for Windows 7. The Windows SDK version requires .NET 4.x as well. This tool is used to author GDF files for both Win32 desktop and Windows Store apps.
Game Definition File Validator (GDFTrace.EXE) is available on MSDN Code Gallery and has been updated for these latest rating systems changes and can build without requiring the DirectX SDK using Visual Studio 2010 or Visual Studio 2012 RC.
Gameux Install Helper (GameuxInstallHelper.DLL) is available on MSDN Code Gallery. It has been updated from the DirectX SDK (June 2010) version and can build without requiring the DirectX SDK using Visual Studio 2010 or Visual Studio 2012. This utility is used for deploying Win32 desktop applications.
For publishers and developers of games on Windows 7, be sure to read Desktop Games for Windows 8 Consumer Preview for recommendations on compatibility for existing Win32 desktop style applications as well as the official Compatibility Cookbook.