[Sh@man]

Да , именно так, но... это работает , если текстовый файл приаттачиваешь директивой #include.
Короче , вот что пишет Макромедия (English)

To include multilinguage text using the #include action:

1 In the Macromedia Flash MX authoring tool, create a dynamic or input text field that will display the text in the movie.
2 Assign a variable to the text field, for example, myTextField .
3 Create a text file that defines the value for the text field variable. Remember to add the header //!-- UTF8 at the beginning of the file.
4 Save the file in UTF-8 format.
5 Use the #include action to include the external file in the dynamic or input text field. For more information, see the entry for #include in the online ActionScript Dictionary (Help > ActionScript Dictionary).