private void tvModSelection_DragDrop(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[]      filenames = e.Data.GetData(DataFormats.FileDrop, true) as string[];
                List <string> accepted  = new List <string>();
                foreach (string filename in filenames)
                {
                    string ext = System.IO.Path.GetExtension(filename).ToLower();
                    if (ext == Constants.EXT_ZIP || ext == Constants.EXT_RAR || ext == Constants.EXT_7ZIP || ext == Constants.EXT_CRAFT)
                    {
                        accepted.Add(filename);
                    }
                }

                if (accepted.Count > 0)
                {
                    ModSelectionController.AddModsAsync(accepted.ToArray());
                }
            }
        }