Susan, what sort of file is it? If it's HTML or something you downloaded from the internet, it may have code that tells it to get something from a specific website or communicate with the site for some other reason. It could be something as innocuous as a hit counter. It could be that the file's opened with a program like Real Audio that automatically checks for upgrades. I HATE that, and there's no way to tell it to knock it off, but it's not trying to do anything terribly devious.