System.useCodepage = true;
trace(escape("指定された条件"));
trace(escape("データ"));

&str1=%8Ew%92%E8%82%B3%82%EA%82%BD%8F%F0%8C%8F&
&str2=%83f%81%5B%83%5E&

System.useCodepage = true;
var my_lv:LoadVars = new LoadVars();
my_lv.onLoad = function(success:Boolean):Void {
	if (success) {
		my_txt.text = this.str1 + newline;
		my_txt.text +=  unescape(this.str1) + newline;
		my_txt.text += "========" + newline;
		my_txt.text += this.str2+ newline;
		my_txt.text += unescape(this.str2) + newline;
	}
};
my_lv.load("data.txt");

System.useCodepage = true;
var my_lv:LoadVars = new LoadVars();
my_lv.onData = function(src:String):Void {
	if (src) {
		var vars:Array = src.split("&");
		for (var n:String in vars) {
			var val:Array = vars[n].split("=");
			if (val[0] != undefined && val[1] != undefined) {
					this[val[0]] = val[1];
			}
		}
		my_txt.text = this.str1 + newline;
		my_txt.text += unescape(this.str1) + newline;;
		my_txt.text += "========" + newline;
		my_txt.text += this.str2 + newline;;
		my_txt.text += unescape(this.str2) + newline;;
	}
};
my_lv.load("data.txt");