private void importHIPArchiveToolStripMenuItem_Click(object sender, EventArgs e) { OpenFileDialog openFile = new OpenFileDialog() { Filter = "All supported file types|*.hip;*.hop;*.ini|HIP archives|*.hip|HOP archives|*.hop|HipHopTool INI|*.ini", Multiselect = true }; if (openFile.ShowDialog() == DialogResult.OK) { archive.ImportHip(openFile.FileNames); } PopulateLayerComboBox(); }