http://blogs.msdn.com/raffael/archive/2008/03/18/x-inf-contains-dirids-which-are-not-supported.aspx
VS2008’s CabWiz can parse up to 262 different entries under [DestinationDirs].
Windows Mobile 6 SDKs ship with a newer version of CabWiz.exe, v4.5.5102.0

Replace C:\Program Files\Microsoft Visual Studio 9.0\SmartDevices\SDK\SDKTools\CabWiz.exe and CabWiz.ddf with the ones under C:\Program Files\Windows Mobile 6 SDK\Tools\CabWiz