Creating .xls file Using Java I/O

Hi,
I am crearting a .xls file from a oracle database that support japanese charsets(i.e it has data in UTF-8 format). I am creating the file using below java statements:
1. Writer out = new OuputStreamWriter(new FileOutputStream("temp.xls"));
2. out.write(data);
So using above statements I am reading data in UTF-8 format and writing it a file using UTF-8 format.
But my created .xls files does not allow me to see japanese characters as they visible in a browser. But in place of temp.xls if I use temp.txt or temp.doc , then I am able to see the japanese characters when those files are view using TEXTPAD OR MS-WORD APPLICATIONS.
I have japanese font installed on my machine. So I am not understanding where the actual problem is with my way of file writing or with MS-EXCEL APPLICATION ....
Please suggest me some solution ....
Thanks in advance......
kumar.

Actually the way u have told result in the same. Even the file is .csv or .xls I am not able to see some japanese characters in my excel application provided I have japanese fonts installed on my machine. But when using the same servlet if i create an .doc or .txt file i am able to see japanese characters when i open .doc or .txt using MS-WORD OR TEXTPAD LIKE APPLICATIONS.

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