Minimal OOXML file

hello.xml

<?xml version="1.0" encoding="utf-8"?>
<?mso-application progid="Word.Document"?>
<pkg:package xmlns:pkg="http://schemas.microsoft.com/office/2006/xmlPackage">
  <pkg:part pkg:contentType="application/vnd.openxmlformats-package.relationships+xml" pkg:name="/_rels/.rels" pkg:padding="512">
    <pkg:xmlData>
      <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
        <Relationship Id="rId1" Target="word/document.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"/>
      </Relationships>
    </pkg:xmlData>
  </pkg:part>
  <pkg:part pkg:contentType="application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml" pkg:name="/word/document.xml">
    <pkg:xmlData>
      <w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
        <w:body>
          <w:p>
            <w:r>
              <w:t>Hi there!</w:t>
            </w:r>
          </w:p>
        </w:body>
      </w:document>
    </pkg:xmlData>
  </pkg:part>
</pkg:package>