//System.useCodePage = true;
var my_xml = new XML();
my_xml.ignoreWhite = true;
my_xml.load('xx.xml');

CR = chr(13); //Mac
LF = chr(10); //Unix
CRLF = CR+LF; //Win

my_xml.onLoad = function(ok) {
	if (ok) {		 //contents  //comment  //text
		var comment = this.firstChild.firstChild.firstChild.nodeValue;
		myTextField.text = comment.split(CRLF).join(LF);
	} else {
	}
};

<contents>
	<comment>サイドブラシ使用時：690mm＆#10;サイドブラシ未使用時：500mm</comment></contents>