C#

Dictionary<string, string> LbItemsToFilePaths = new Dictionary<string, string>
{
   {"ABC", @"D:\Music\XYZ"},  {"XYZ", @"D:\Music\Old\XYZ"} 
};

private void Form1_Load(object sender, EventArgs e)
{
    listBox1.DataSource = new BindingSource(LbItemsToFilePaths, null);
    listBox1.DisplayMember = "Key";
    listBox1.ValueMember = "Value";
}

// then you can get the filepath from the 'SelectedValue property of the ListBox
// when the user selects an item at run-time:
string selectedFilePath;

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    selectedFilePath = listBox1.SelectedValue.ToString();
    Console.WriteLine(selectedFilePath);
}

var