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Stream stream = GetFileFromFtp("sample.docx");
using (Viewer viewer = new Viewer(stream))
{
    HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources();                
    viewer.View(viewOptions);
}
        
static Stream GetFileFromFtp(string filePath)
{
    Uri uri = new Uri(filePath);
    FtpWebRequest request = CreateRequest(uri);
    using (WebResponse response = request.GetResponse())
        return GetFileStream(response);
}

static FtpWebRequest CreateRequest(Uri uri)
{
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
    request.Method = WebRequestMethods.Ftp.DownloadFile;
    return request;
}

static Stream GetFileStream(WebResponse response)
{
    MemoryStream fileStream = new MemoryStream();
    using (Stream responseStream = response.GetResponseStream())
        responseStream.CopyTo(fileStream);
    fileStream.Position = 0;
    return fileStream;
}