$code = @" using System; using System.IO; using System.Text; using System.Windows.Forms; public class Program { [STAThread] public static void Main() { OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Filter = "テキスト|*.txt|全て|*.*"; openFileDialog.FilterIndex = 2; openFileDialog.InitialDirectory = @"C:\"; if (openFileDialog.ShowDialog() != DialogResult.OK) { return; } Console.WriteLine(openFileDialog.FileName); string path = openFileDialog.FileName; if ( File.Exists(path) ) { Console.WriteLine("{0} は存在しています", path ); } // SHIFT_JIS Encoding Enc = Encoding.GetEncoding(932); try { using (StreamReader ReadFile = new StreamReader(path, Enc)) { // 読込み string Text = ReadFile.ReadToEnd(); // 全て読み込んでいるので閉じる ReadFile.Close(); Console.WriteLine(Text); } } catch (Exception ex) { Console.WriteLine(ex.Message); } Console.ReadLine(); } } "@ Add-Type -Language CSharp -TypeDefinition $code -ReferencedAssemblies ("System.Windows.Forms") [Program]::Main()