[Decode]

Маленький пример можно?

<div>
  <input type="file" />
  <button onclick="foo(this)">Очистить</button>
</div>

<script>
  function foo(elem) {
    var prevElem = elem.previousElementSibling;

    var newElem = document.createElement('input');
    newElem.type = 'file';

    elem.parentNode.replaceChild(newElem, prevElem);
  }
</script>