I am having the same issue as well.
>wsdl.exe /n:Vim25Api %WSDLHOME%\Vim25\vim.wsdl %WSDLHOME%\Vim25\vimService.wsdl
FAILS with
Could not find a part of the path <rest of the path>\vmware\sdk\sdk\vsphere-ws\wsdl\vim25\query-messagetypes.xsd'.
With over 400 views - it would be nice to get an answer.