InfoPath Dev

I'm getting a error when I want to export a XML file to mht. I have a vbscript that opens a xml file and it must then export it to mht.

The error I'm gettig is :
Infopath has encountered an error. The Operation failed.
The form cann't be exported.
The paramenter is incorrect

Code 80070057
Source infopath

It is en form published on our intranet site.
I need to export the xml to mht.

Set appInfoPath = CreateObject("InfoPath.Application")

appInfoPath.XDocuments.Open(xmlFile)
appInfoPath.XDocuments(0).View.ForceUpdate
appInfoPath.XDocuments(0).view.Export mhtLocation, "mht" ( this is where I get the error)
 appInfoPath.XDocuments(0).Close
appInfoPath.Quit

Is 'view' supposed to be capitalized in the line with the error? What about 'mht'? In the MSDN documentation, it looks like View and MHT.