Programatically avoid warnings while converting using word api

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C#

Hi,

i am converting html document into plain text using the below funcion

private void TextFileConvertion(string strsource, string strtarget)
        {
            // Use for the parameter whose type are not known or  
            // say Missing
            object Unknown = Type.Missing;
            //Creating the instance of Word Application
            Word.Application newApp = new Word.Application();
            newApp.DisplayAlerts = Word.WdAlertLevel.wdAlertsNone;
            try
            {
                lblProgress.Text = "Converting " + strsource + " into Text file is under process.";
                Application.DoEvents();
                // specifying the Source & Target file names
                object Source = strsource;
                object Target = strtarget;
                 
                // Source document open here
                // Additional Parameters are not known so that are  
                // set as a missing type
                newApp.Documents.Open(ref Source, ref Unknown,
                     ref Unknown, ref Unknown, ref Unknown,
                     ref Unknown, ref Unknown, ref Unknown,
                     ref Unknown, ref Unknown, ref Unknown,
                     ref Unknown, ref Unknown, ref Unknown, ref Unknown, ref Unknown);
                // Specifying the format in which you want the output file 
                object format = Word.WdSaveFormat.wdFormatText;
                //Changing the format of the document
                newApp.ActiveDocument.SaveAs(ref Target, ref format,
                        ref Unknown, ref Unknown, ref Unknown,
                        ref Unknown, ref Unknown, ref Unknown,
                        ref Unknown, ref Unknown, ref Unknown,
                        ref Unknown, ref Unknown, ref Unknown,
                        ref Unknown, ref Unknown);
            }
            catch (Exception ex)
            {
                ZoniacLogger.Error("Exception : " + ex.Message + " Stack Trace : " + ex.StackTrace);
            }
            finally
            {
                if (newApp != null)
                {
                    // for closing the application
                    newApp.Quit(ref Unknown, ref Unknown, ref Unknown);
                    newApp = null;
                }
            }
        }

while executing above code , i get a warning like this :

"Linked style sheets are supported only in web format files. By
saving to this format , all links to style sheets would be lost"

After i click "continue" ,it converts the html document into text file.
How can i avoid such warnings through the program ?
Can anybody help me to overcome this problem. waiting for solution.

regards
kumaran