Have you tried specifying the charset via meta tags (within the content)?
<cfcontent type="application/vnd.ms-excel; charset=utf-8">
<cfheader name="Content-Disposition" charset="utf-8" value="inline;
filename=inv.xls">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<body>
æ¥æ¬èª: Java ãã©ãããã©ã¼ã ã«ãããè£å©æåã®ãµãã¼ã
䏿: Java å¹³å°ä¸çå¢è¡¥å符
</body>
</html>
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