Reading TNEF APPTIME is not correct

[Sicos1977]

Hi... just found a little bug. The way you read apptime and systime in your tnef reader should be like this.
You now read apptime and systime as dates from 1-1-1601 and that is only for the systime and not for apptime.

APPTIME: 8 bytes; a 64-bit floating point number in which the whole number part represents the number of days since December 30, 1899, and the fractional part represents the fraction of a day since midnight

                case PropertyType.PT_APPTIME:
                    var oaDate = BitConverter.ToDouble(Data, 0);
                    return DateTime.FromOADate(oaDate);

                case PropertyType.PT_SYSTIME:
                    var fileTime = BitConverter.ToInt64(Data, 0);
                    return DateTime.FromFileTime(fileTime);

[jstedfast]

Thanks!