xcdExtraHeader
{
 xehNone = 0,
 xehExtTimeStamp = 1,
 xehFileTimes = 2,
 xehSecurityDescriptor = 4,
 xehUnicode = 8,
 xehUTF8Filename = 32,
 xehUTF8Comment = 64,
}

This enumeration is used by the ExtraHeaders property. Explanations on each parameter can be found in the that property's help topic.