public static void Run()
{
string dataDir = RunExamples.GetDataDir_Outlook();
string fileName = dataDir + "message3.msg";
// ExStart:ReplaceEmbeddedMSGAttachmentContents
var message = MapiMessage.FromFile(fileName);
var memeoryStream = new MemoryStream();
message.Attachments[2].Save(memeoryStream);
var getData = MapiMessage.FromStream(memeoryStream);
message.Attachments.Replace(1, "new 1", getData);
// ExEnd:ReplaceEmbeddedMSGAttachmentContents
message.Save(dataDir + "ReplaceEmbeddedMSGAttachmentContents_out.msg");
}