How about the following. Change the font name as appropriate.
Code:
Sub SaveUnicode()
Dim strName As String
Const strFont As String = "Times New Roman" 'the font to apply
If Len(ActiveDocument.Path) > 0 Then
strName = Left(ActiveDocument.FullName, InStrRev(ActiveDocument.FullName, ".") - 1) & ".txt"
Else
strName = Options.DefaultFilePath(wdDocumentsPath) & "\MyDocument.txt"
End If
ActiveDocument.Range.Font.Name = strFont
ActiveDocument.SaveAs2 FileName:=strName, FileFormat:=wdFormatUnicodeText
End Sub