I’m not exactly sure what file you are talking about, nor have I attempted this to see if it works… but it sounds like the accent character of the font you are using is not embedded in the file. If the textfield that contains the text you are trying to input into is an object in your .fla, select the text field and choose the ‘embed’ options in the properties panel. Select to embed all characters, and see if that works for you… you may also have to try using a different font if the font you are using does not contain that accent character.
If the textfield is created via ActionScipt double check that the font is embedded in you library… and that the font you are using contains the accent character.