Here is an interesting one. On a specific server I have to work on, there is a bunch of ZIP files in a directory. They all have the WinZip icon. If I click on the file, we should expect WinZip to show the list of files in the ZIP. This works, but before, I receive a message having a title Internet Explorer where it says: "This page has an unspecified potential security flaw. Would you like to continue?". So, what does Internet Explorer has to do with the ZIP extension?