Allow A User To Edit A Textfile From Within A Program?

I have a combobox (combobox1) with a list of countries, Canada, USA, UK as an example. For each country I have a textfile of cities. I choose a country, which populates combobox2 .i.e. I select Canada from combobox1. Combobox2 shows cities for Canada. I also have a button 'Edit Cities' What I want to accomplish is the following:Open some type of text editor (like notepad) and allow the user to either delete or add items to the list of cities then re-save the file back to the resources folder of my program. I have been successful in reading the textfile to a messagebox but of course can't do anything with it.

Here is a code snipet I have so far:

Private Sub btnEdit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEdit.Click
If combobox1.SelectedIndex = 0 Then
Dim fileReader As String

[code].....