public FileSystemBrowserControl()
 {
     _regexes = new List <Regex>();
     InitializeComponent();
     FileImages.Images.Add("_Folder", FileSystemIcons.GetFolderIcon(FileSystemIcons.SystemIconSize.Small, FileSystemIcons.SystemFolderType.Open));
     FileImages.Images.Add("_Unknown", FileSystemIcons.IconFromExtension(".unknown", FileSystemIcons.SystemIconSize.Small));
 }
        private string GetIcon(string file)
        {
            var ext = (Path.GetExtension(file) ?? "").Trim('.').ToLower();

            if (ext == "")
            {
                return("_Unknown");
            }
            if (!FileImages.Images.ContainsKey(ext))
            {
                FileImages.Images.Add(ext, FileSystemIcons.IconFromExtension(ext, FileSystemIcons.SystemIconSize.Small));
            }
            return(ext);
        }