Well... it might be correct and just shown improperly depending on what you are using to do the viewing. Do you have access to something that will show you the actual hex value of that character in the file?
Note that you do not use quotes in that property in the stage. Also note that while 172 is the decimal value of that character (and thus valid for the char function but may not be valid for that property) its hex value is "\x00AC". If that doesn't work, you may need to tell it to use Unicode: "\u00AC" - again, without the quotes.