public DisableSweetFxChange(string acRoot) {
_acSweetFx = Path.Combine(acRoot, "d3d11.dll");
if (!File.Exists(_acSweetFx)) {
_acSweetFx = Path.Combine(acRoot, "dxgi.dll");
}
_acSweetFxBackup = _acSweetFx + "~at_bak";
if (File.Exists(_acSweetFx) && !File.Exists(_acSweetFxBackup)) {
File.Move(_acSweetFx, _acSweetFxBackup);
}
}