Downloading files from web sites like rapidshare!

[C++ Programming]

Hi
I have written a downloader program that can download files from internet (with resume support).
But after I pass the file address and username and password of my account in rapidshare it can not download it, it just download a html file:
m_pHttpConnection = m_InternetSession.GetHttpConnection(sServer, nPort, sUser, sPassword);
also this function returns FALSE :
file.SendRequest(NULL);

Does anybody know how to pass username and password to rapisdhare or other sharing web sites?
Regards
Hadi

www.logicsims.ir