Email Attachment local file - Appcelerator Titanium

app.js

var win = Ti.UI.createWindow({
    backgroundColor : "gray"
});

var btn = Ti.UI.createButton({
    title : "open email dialogue",
    top : 100,
    left : 100,
    height : 150,
    width : 150
});

btn.addEventListener("click", function() {
    var emailDialog = Ti.UI.createEmailDialog();
    emailDialog.subject = "Hello from Titanium";
    emailDialog.toRecipients = ['xyzabc@yahoo.com'];
    emailDialog.messageBody = '<b>Appcelerator Titanium Rocks!</b>';
    var f = Ti.Filesystem.getFile('cricket.wav');
    emailDialog.addAttachment(f);
    emailDialog.open();
});

win.add(btn);
win.open();