Change the xml processing instructions using msxml (c++)

Hi All,

Please help to change the xml processing instruction using msxml. c++

<?xml-stylesheet type="text/xsl" href="D:\SAMPLE.xsl"?> 

This  href="D:\SAMPLE.xsl" need to change to  href="D:\new.xsl"

mydummy.xml  ( input xml)

................

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="D:\SAMPLE.xsl"?>
<Data>
<Header>
</Header>
<Values
</values>
</Data>

mydummy.xml  ( expected output xml after modifying style sheet value)

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="D:\new.xsl"?>
<Data>
<Header>
</Header>
<Values
</values>
</Data>