Does anyone know why the PB docs for build.exe defines a whole slew of
command line options which do not appear to be supported by the actual tool
itself as it comes with PB5?

Docs: http://msdn2.microsoft.com/en-us/library/aa448614.aspx

build.exe: %_WINCEROOT%\PUBLIC\COMMON\OAK\BIN\I386\build.exe

Regards,
Tom