Home How can I avoid showing extensions on one Filter option in OpenFileDialog?
 In addition to a list of supported file formats, I want to have a catch-all of "All Supported Files". I want the extensions to be displayed for the individual formats, but not for the catch-all. I thought this would do it:  const string OpenFileFilters = "AAA Files (*.aaa)|*.aaa|" + "BBB Files (*.bbb)|*.bbb|" + "CCC Files (*.ccc)|*.ccc|" + "DDD Files (*.ddd)|*.ddd|" + "EEE Files (*.eee)|*.eee|" + "FFF Files (*.fff)|*.fff|" + "GGG Files (*.ggg)|*.ggg|" + "HHH Files (*.hhh)|*.hhh|" + "III Files (*.iii)|*.iii|" + "All Supported Files |*.aaa;*.bbb;*.ccc;*.ddd;*.eee;*.fff;*.ggg;*.hhh;*.iii"; var dialog = new OpenFileDialog { InitialDirectory = FileUtilites.ValidateInitialDirectory(initialDirectory), Filter = OpenFileFilters, FilterIndex = Settings.Default.OpenFileFilter, Multiselect = true }; var result = dialog.ShowDialog();  But it gives me this: Is there some way to specify the Filter string so that it will not include the long list of extensions on that last option?