I was viewing a pdf document on a website using Mozilla Firefox browser. I could view it without any problem. But then I needed to download it on my system. I have integrated Adobe Reader X with Mozilla Firefox 3.6 in my system to provide direct download option for download of pdf documents. When I downloaded, it got saved in my PC normally, but when I tried opening it offline on my system, it failed to open. I tried downloading it again thinking that the download was interrupted the 1st time, but next time the option in toolbar of Firefox was disabled. Same problem occurs with other Browser. I tried Internet Explorer and Opera. Does anybody know what is happening?