It asked for zip file, which it found particularly which application to use to open it up.
I found this link which explains how to bring up that option in all browsers, so there is an option and this is through browser not OS. http://www.php.net/manual/en/function.header.php#102175
So the option might have come from the server side code, so no prob with that. But all i am interested is the second step done by the browser. When i click "open with" it downloads to temp file (fine till this) and executes the file from there (how this is done?)
How is the browser able to fire that command?
And one more thing, if i select do this automatically for following files then all my files will be executed w/o asking!!