non.ascii characters in property files

[Marit]

I want to make my application multi-lingual. I use ResourceBundle to resource locale-spesific strings into res.properties file.
When I create a res_zh_TW.properties file (trad. chinese), and replace the latin characters in the strings with chinese characters, my application do not display this characters properly.
I have the correct fonts installed. The encoding is set to UTF8 in project properties. The .properties file is stored in UTF8 format.

When I convert the .properties file by using native2ascii, the chinese characters in the .properties are converted to unicode escape chars, and the chars are displayed perfect. The disadvantige here is that I need to have two .properties files. One for the translater, and one that the application use.

Is there a way to make the application understand the chinese characters in a .properties file without converting them to unicode escape chars?