I\'m only finding stuff on how to change the attribute values of a XML element here on StackOverflow.
But how do we change the value of the element itself using Pow
InnerText is a property, not a method. It's used like this:
$element.InnerText = "newtext"
Also, I suspect that your original data (unlike the XML sample you posted) uses namespaces. AFAICS that's the only possible reason why $xml.SelectSingleNode('//Arguments') would return an empty result.
XML files exported from the Windows Task Scheduler definitely are namespaced:
Namespaces are not like other node attributes and affect not only the node itself, but also its child nodes. For selecting nodes from an XML with namespaces you need a namespace manager:
$nsm = New-Object Xml.XmlNamespaceManager($xml.NameTable)
$nsm.AddNamespace('ns', $xml.DocumentElement.NamespaceURI)
$element = $xml.SelectSingleNode('//ns:Arguments', $nsm)