OpenFileDialog.ShowReadOnly
using System; using System.Windows.Forms; public class OpenFileDialogSetFiles { public static void Main() { OpenFileDialog dlgOpen = new OpenFileDialog(); dlgOpen.Title = "Select one or more files"; dlgOpen.ShowReadOnly = true; dlgOpen.Multiselect = true; if (dlgOpen.ShowDialog() == DialogResult.OK) { foreach (string s in dlgOpen.FileNames) Console.WriteLine(s); } } }