Unsupported browser error

[lcluff2000]

When using the following code, I get the error shown below. I am using IE 8. Do you know what could be the problem?

Code:

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HtmlDoc d.InitFromWeb("http://test.com/test.aspx")
str s=d.GetText
out s

Message from webpage
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You are using an unsupported browser. This site will not function well under any browser other than Internet Explorer version 5.5 or better. You will be redirected to the Microsoft download page.
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OK
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