Sorry for going into hibernation for so long. Extracting the string part is ok. But the problem is the downloaded content is not coherent. The code is not in order and some of the lines appear two times etc. I changed the extension of the file to html and opened it in IE. The page was not similar to the page downloaded.There were some errors.
May be using internetreadfile is complicated. Is there any way to know if the downloaded file is in order.