myenv/lib/python3.10/site-packages/docx/templates/default-header.xml

<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
<w:hdr
    xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:mo="http://schemas.microsoft.com/office/mac/office/2008/main"
    xmlns:mv="urn:schemas-microsoft-com:mac:vml"
    xmlns:o="urn:schemas-microsoft-com:office:office"
    xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
    xmlns:v="urn:schemas-microsoft-com:vml"
    xmlns:w10="urn:schemas-microsoft-com:office:word"
    xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml"
    xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"
    xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml"
    xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing"
    xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing"
    xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas"
    xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup"
    xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk"
    xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape"
    mc:Ignorable="w14 wp14"
    >
  <w:p>
    <w:pPr>
      <w:pStyle w:val="Header"/>
    </w:pPr>
  </w:p>
</w:hdr>