I’ve just found a typo in the Windows PE 3.0 Users guide.
dism /image:C:\winpe_x86\mount /Add-Package /PackagePath:”C:\Program Files\Windows OPK\Tools\PETools\x86\WinPE_OCs\winpe-wmi.cab”
dism /image:C:\winpe_x86\mount /Add-Package /PackagePath:”C:\Program Files\Windows AIK\Tools\PETools\x86\WinPE_OCs\winpe-wmi.cab”
“OPK” should be replaced with “AIK” otherwise if you copy paste the sample commandline adding an optinonal component will not work.