You can set ActionScript preferences
to specify the type of encoding to use in imported or exported ActionScript
files. UTF‑8 Encoding is 8‑bit Unicode format, which lets you include
text in multiple languages in your file; Default Encoding is the
encoding supported by the language your system is currently using,
also called the traditional code page.
Important: When you use a non-English application
on an English system, the Test Movie command fails if any part of
the SWF file path has characters that cannot be represented by using
the Multibyte Character Sets (MBCS) encoding scheme. For example,
Japanese paths, which work on a Japanese system, won’t work on an English
system. Be sure to use English-only path names on English systems.
All areas of the application that use the Test Movie player are
subject to this limitation.
This page on the Web