How to create VM without OVFtool in ESX 3.5?

Hi,

  Now I have a problem with OVFtool. I want to create a virtual machine on an ESX 3.5 server, but i don't want to use the OVF tool and the VI client. I know that there is a managed object called "OvfManager" in the VMWare API, but this object is supported only by vSphere 4.0 and higher. Is there any method that I can use the API to create the VM from the OVF file, without using the OVFtool? Thanks.