1
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.FileName = "Document"; // Default file name
dlg.DefaultExt = ".txt"; // Default file extension
dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files by extension here
私は複数のタイプhttp://msdn.microsoft.com/en-us/library/system.windows.forms.filedialog.filter.aspxからはMicrosoft.Win32.OpenFileDialog()