/// <summary>
/// Restores the AWG's settings from a speficied settings file and MSUS for the external source
///
/// AWGControl:SREStore
/// </summary>
/// <param name="extSource">the EXTSOURCE object</param>
/// <param name="filename">settings file to load</param>
/// <param name="msus">mass storage unit specifier aka drive</param>
public void SetExtSrcFileWithMsusRestore(IEXTSOURCE extSource, string filename, string msus)
{
if (msus != "")
{
msus = "," + "\"" + msus + "\"";
}
extSource.SetExtSrcFileWithMsusRestore(filename, msus);
}