After some days I read about that, I write next things:
my xml:
<settings>
<sitenames>
<setting property="prop1">value1</setting>
<setting property="prop2">value2</setting>
</sitenames>
</settings>
my .vbs:
Dim xmlPath
Dim xmlDoc
xmlPath = Session.Property("IS_BROWSE_FILEBROWSED")
set xmlDoc = CreateObject("Microsoft.XMLDOM")
xmlDoc.async = "false"
xmlDoc.load(xmlPath)
for each x in xmlDoc.getElementsByTagName("Setting")
Session.Property(x.getAttribute("property")) = x.text
next
and it works very well :D