Open XML in excel with javascript?

I have a spread*** saved as an XML spread*** so I can manipulate
it easier (and don't need COM). When I'm done, I want to display to
the user. Currently, I'm using simple JavaScript in my PHP file to
display the file when complete:
echo '<script type="text/javascript"> window.open("'.$file_nm.'")</
script>';

Since the file is .XML, which defaults to the browser to open - the
above code will display the XML as raw XML (text) in a new browser
window - rather than opening with excel.
In the XML is:
<?mso-application progid="Excel.***"?>
So, if the XML is saved locally - then opened, it will default to
Excel to open.

Is there anyway for the script to indicate that excel should be used
to open, rather than the (default) for XML - which is the browser?

Thanks in advance.
.

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