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I have following piece of code: public void ProcessRequest (HttpContext context) { context.Response.ContentType = "text/rtf; charset=UTF-8"; context.Response.Charset = "UTF-8"; context.Response.ContentEncoding = System.Text.Encoding.UTF8; context.Response.AddHeader("Content-disposition", "attachment;filename=lista_obecnosci.csv"); context.Response.Write("ąęćżźńółĄŚŻŹĆŃŁÓĘ"); } When I try to open generated csv file, I get following behavior: In Notepad2 - everything is fine. In Word - conversion wizard opens and asks to convert the text. It suggest UTF-8, which is somehow ok. In Excel - I get real mess. None of those Polish characters can be displayed. I wanted to write those special encoding-information characters in front of my string, i.e. context.Response.Write((char)0xef); context.Response.Write((char)0xbb); context.Response.Write((char)0xbf); but that won't do any good. The response stream is treating that as normal data and converts it to something different. I'd appreciate help on this one.

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