Test the package Apache_OpenOffice_incubating_3.4.0_Win_x86_install_en-US.exe  with Windows App Certification Kit on windows 8 release preview, get this warning result, it will be passed in order to pass the Windows 8 certification program.
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Related links:
Windows 8 Preview ISO image
http://windows.microsoft.com/en-US/windows-8/iso
Windows App Certification Kit
http://msdn.microsoft.com/en-us/windows/desktop/hh852363
Certification requirements for Windows 8 desktop apps
http://msdn.microsoft.com/library/windows/desktop/hh749939
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The result.
Digitally signed file test

WARNING
    Install signed driver and executable files
All unsigned files of the following extensions: EXEs, DLLs, SYS, DRV, OCX, SCR, and CPL will be reported.

    Warning: The file, driver signing test detected the following errors:
        Non-driver file C:\Program Files\OpenOffice.org 3\program\ucptdoc1.uno.dll does not have a valid signature, either embedded or via a catalog file.
        Non-driver file C:\Program Files\OpenOffice.org 3\program\ucpext.uno.dll does not have a valid signature, either embedded or via a catalog file.
        Non-driver file C:\Program Files\OpenOffice.org 3\program\ucpexpand1.uno.dll does not have a valid signature, either embedded or via a catalog file.
        Non-driver file C:\Program Files\OpenOffice.org 3\program\nssckbi.dll does not have a valid signature, either embedded or via a catalog file.
        Non-driver file C:\Program Files\OpenOffice.org 3\program\nss3.dll does not have a valid signature, either embedded or via a catalog file.
       .......
    If any of the above files are DLLs, OCX, SCR, CPL or EXEs that are not one of the application’s main executables (has a shortcut on start menu or desktop), they can safely be ignored. All others need to be signed to meet the Windows App Certification requirements.
    Impact if not fixed: Having digitally signed files allows users to know that software is genuine. It makes it possible to detect that a file has been tampered with, such as by a virus. Windows has the ability to prevent any unsigned app from launching with administrator access. Sign the app if you want it to operate correctly in locked-down environments without popup or UAC messages.
    How to fix: You can safely ignore the unsigned DLL, .OCX, .SCR, .CPL or .EXE files listed here that are not one of the app’s main executable, or a driver. All files except drivers must be Authenticode signed, drivers must be WHQL certified. See link below for more information:
    Digital Signatures for Kernel Modules on Windows 
http://go.microsoft.com/fwlink/?LinkId=247357
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Please see the wiki page for full test result.
http://wiki.services.openoffice.org/wiki/Documentation/Windows_App_Certification_Kit_-_Test_Results_for_Apache_OpenOffice_3.4