Hello, I am developing a small application in PHP on Windows IIS. Using this application users can upload a file and then send the URL to another user so he/she can download the file. I want to know as to how can I hide the URL of uploaded file from users!? Further more how can I make sure that they can't access the file directly! One more thing is I want JPEG, TXT and other files which can be opened directly in a browser to be downloaded just like ZIP, EXE and other files when some user clicks on the URL. These are the techniques used by all email provides like Hotmail, Yahoo and Google where you cannot see the URL of attached file and when you click on it, it downloads the file irrespective of its extension. Similarly you cannot directly access the file by typing it in browser. Thanks Ali