how to generate a xml file for my VB project?

Question

We are created a application using VB.So,Whenever i click the project exe file i want to create a xml file and store some config.details for my application for further needs.

Now i created that xml file in my local drive(d:\\appConfig\\config.xml).But we have to handover only our project exe to client.So,Client may have the D drive or not.So, How do i create the config xml file in common to all client machine.

This is my code:

Dim doc As XmlDocument = New XmlDocument
doc.Load("D:\appConfig\trial.xml")
Dim newElem As XmlElement
      newElem = doc.CreateNode(XmlNodeType.Element, "file", "testing")
      newElem.SetAttribute("filename", filenameenc)
      newElem.SetAttribute("expdate", g)
Dim root As XmlElement = doc.DocumentElement
    root.AppendChild(newElem)
doc.Save("D:\appConfig\trial.xml")

Is there any way to create the config xml?

Please guide me to get out of this issue?