In this tutorial, we cover using the special folders to retrieve the path of a special folder on a machine. when you want open folder as default folder like my documents, downloads etc.
Copy and paste below Code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim thepath As String = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
Process.Start(thepath & "\image.jpg")