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Unicode in HTML Output

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I have an Applet which assembles the results of an SQL query in HTML format, putting the results into a public ByteArrayOutputStream. This output stream is accessed by the calling HTML file in which some JavaScript issues a document.write command to display the results in the browser.
The problem starts when (in Internet Explorer 4) I select File/Save As, saving the output to an HTML file. When I try to open this HTML file in Microsoft Excel 97, Excel complains that the file is not in a recognisable format but opens it up anyway, although it has a funny squiggle at in the first cell.
I think that the problem may be Unicode (Wordpad won't open the output, saying that it has Unicode in it) so have tried to ensure that the Applet outputs only ASCII text using the following code:
public ByteArrayOutputStream outputBytes
= new ByteArrayOutputStream();
for (int i = 0; i < outputString.length(); i++) {
This isn't working.
I'm not sure whether the problem is with my understanding of Java, JavaScript, HTML or Excel.
Thanks for any assistance.
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