winrm running against my Vagrant-installed Win2k8

gistfile1.rb

require 'winrm'
require 'kconv'

endpoint = 'http://192.168.33.10:5985/wsman'
winrm = WinRM::WinRMWebService.new(endpoint, :plaintext, :user => 'Vagrant', :pass => 'vagrant')
shell = winrm.open_shell
output = winrm.run_command shell, 'dir'
result = winrm.get_command_output(shell, output)

=begin
That returns:
{
  :data => [
    { 
      :stdout => " Volume in drive C has no label.\r\n"
    }, {
      :stdout => " Volume Serial Number is B06B-7602\r\n\r\n Directory of C:\\Users\\Administrator\r\n\r\n13/12/2012  12:47 PM    <DIR>          .\r\n13/12/2012  12:47 PM    <DIR>          ..\r\n11/12/2012  09:49 PM    <DIR>          Contacts\r\n11/12/2012  09:49 PM    <DIR>          Desktop\r\n11/12/2012  09:49 PM    <DIR>          Documents\r\n13/12/2012  10:01 AM    <DIR>          Downloads\r\n11/12/2012  09:49 PM    <DIR>          Favorites\r\n11/12/2012  09:49 PM    <DIR>          Links\r\n11/12/2012  09:49 PM    <DIR>          Music\r\n13/12/2012  12:41 PM                63 password.inf\r\n11/12/2012  09:49 PM    <DIR>          Pictures\r\n11/12/2012  09:49 PM    <DIR>          Saved Games\r\n11/12/2012  09:49 PM    <DIR>          Searches\r\n13/12/2012  12:47 PM         1,056,768 secedit.sdb\r\n13/12/2012  12:44 PM            16,404 vbox-secpol.inf\r\n11/12/2012  09:49 PM    <DIR>          Videos\r\n               3 File(s)      1,073,235 bytes\r\n              13 Dir(s)  22,605,975,552 bytes free\r\n"
    }
  ], 
  :exitcode => 0
}
=end