Uploading a local file to Innovator using the Batch Loader

I've realized now that I need to specify a relationship to a vault  and have changed the AML to the following:

  <Item type="Document File" action="add">
      <related_id>
        <Item type="File" action="add">
          <actual_filename>C:\some\file\path\@1</actual_filename>
          <filename>@1</filename><Relationships><Item type="Located" action="add"><related_id>67BBB9204FE84A8981ED8313049BA06C</related_id></Item></Relationships> </Item>

However now I am greeted with a "File does not exists" exception even though the file does exist at the fully qualified path specified by <actual_filename> tag