Locating VMX path of a VM in VirtualCenter using VixCOM

Hello,

I'm trying to add the ability to power on a VM into my utility.

The VM is located on an ESX 3.5 host managed by a VI centre/client (2.5)

I'm using VixCOM 1.6.x

All the samples in the world that I have been able to locate for a "PowerOn" require a host.Open command that requires the path to a VMX file.

What if I don't know that path or file name ?

All I have is a  DNS hostname of the VM or perhaps the VM ID from the Virtual Centre SQL Database.

How can I find out the path to the VMX ?

Thank you for your help.

dks99