Flash is read only. You need some sort of serverside script to write data to
a file. php, cfm, asp, cgi or perl.
There is a sample here that uses php to update an xml file that displays a
guestbook:
http://www.kirupa.com/web/xml_guestbook3.htm

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Dan Mode
--> Adobe Community Expert
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> Why can't you use the .send method to load data into a locally stored XML
> file?
> Can anyone out there please answer my question!? I find it absurd that you
> can
> read data in from a locally stored XML object but not update or write to
> it!