I don't know anything about HTA as I tend to avoid Microsoft-proprietary technologies. However, the question seems to be general. If you want to update a file on a server then you will need to have something running on the server that enables this. The usual approach is to collect together the user's input into the HTML form fields, construct a URL with parameters which is sent to the server, and have the server run an XSLT transformation which uses these parameters to transform the XML document.
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Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer\'s Reference
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