encode_base64.wsf

<?xml version="1.0" encoding="utf-8"?>
<job>
<object id="dom" progid="Msxml2.DOMDocument.6.0"/>
<object id="ado" progid="ADODB.Stream"/>
<reference object="ADODB.Stream"/>
<script language="JScript"><![CDATA[
(function() {
	var input = WSH.arguments(0);

	ado.open();
	ado.type = adTypeBinary;
	ado.loadFromFile(input);
	var binary = ado.read();
	ado.close();

	var element = dom.createElement('tmp');
	element.dataType = 'bin.base64';
	element.nodeTypedValue = binary;
	var text = element.text;

	WSH.echo(text);
})();
]]></script>
</job>