[Guid("123565C4-C5FA-4512-A560-1D47F9FDFA20")]
public interface IConfig
{
    [DispId(1)]
    string Destination{ get; }
    
    [DispId(2)]
    void Unserialize();
    
    [DispId(3)]
    void Serialize();
}

[ComVisible(true)]
[Guid("12AC8095-BD27-4de8-A30B-991940666927")]
[ClassInterface(ClassInterfaceType.None)]
public sealed class Config : IConfig
{
    public Config()
    {
    }
    public string Destination
    {
        get { return ""; }
    }
    public void Serialize()
    {
    }
    public void Unserialize()
    {
    }
}