Cannot Import OVF into ESXi 3.5

Using a seperate process (python-vm-builder), I am building an ESX/ESXi compliant image that I have confirmed can be uploaded, imported and started in Workstation, ESX 3.0, ESXi 3.5 and even Server 2.0+.

I'm trying to go into the next step now, and convert this ESXi Image into a single OVF archive for even easier deployments.

Using the latest OVF Tool I have successfully created the new .ovf and zipped it up inside a tar.gz'd.  On my Windows box, I then extract it (using WinRAR), then using 'Import' in VIC try to import it.  When I select the OVF and click next it then throws the below error:

An error occurred while parsing the OVF descriptor

Unable to parse XML element 'Envelope'

What am I doing wrong? 

I have attached both the original VMX and the new OVF.

Please help!

Thank you.