You've probably used Apple's Quicktime video app for years, but if you're a Windows user, you should stop using it ASAP! The critical security updates that allow you to safely use it have not been available to Windows user for years now.and#160; If you're using Quicktime on a Mac computer, there's nothing to worry about as security updates have continued to be delivered to you. Windows users should not only stop using the program, they should uninstall it completely to avoid accidentally using it. For most Windows users, Quicktime really isn't necessary any more, but if you find that you have older files that need it, use a free open source alternative called VLC instead. The program works with just about any type of old or new video file and it's available for just about every device you own.and#160; Get it at: https://www.videolan.org/vlc