private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
{
extractToolStripMenuItem.Enabled = fileList.HasSelection;
copyNameToolStripMenuItem.Enabled = (fileList.HasSelection && CASCFolder.GetFiles(viewHelper.DisplayedEntries, fileList.SelectedIndices.Cast<int>(), false).Count() > 0) || false;
getSizeToolStripMenuItem.Enabled = fileList.HasSelection;
}