Mac's work a bit differntly in this aspect than a PC jdboca. I believe in windows internet explorer, when you click a movie, you have the option to save to disk, or to open. When you click open, it just saves it in a temporary place and then opens it with the appropreate application. On the Mac you will have to 'save' the file and then open it. Browsers will do this for you however by setting them to look at the extention of the file. If the video is supported by Quicktime and you have the browser plug-in then you can view it directly in the browser.