How to show Vietnamese characters in subjects mail .msg file Outlook (saved by C#)?

问题

I am using this code to save a object Outlook.MailItem to .msg file.

Outlook.Application app = new Outlook.Application();
Outlook.MailItem email = app.CreateItemFromTemplate(pathMail, Type.Missing);
email.To = "temp@gmail.com"
email.Subject = txtSubject.Text;
email.Body = txtBody.Text;
email.SaveAs(pathSave, Outlook.OlSaveAsType.olMSG);

It is great working, but it have a bug. If I write Vietnamese in txtSubject, the subject in .msg file will show "?" for Vietnamese characters.
Example: "Kiểm tra font tiếng Việt" --> "Ki?m tra font ti?ng Vi?t"
In body of .msg file, Vietnamese characters still show correctly (Image )
And when I open .msg file by Notepad, I see Encoding follow:

< ?xml version="1.0" encoding="UTF-8" standalone="yes"?>

Thank all.

回答1:

Use olMsgUnicode format instead of olMsg.

来源：https://stackoverflow.com/questions/37451220/how-to-show-vietnamese-characters-in-subjects-mail-msg-file-outlook-saved-by-c