They are AVdn codec 1280.720 61,388 bit rate I can open them with VLC, but that’s about it. If you encounter media that requires the installation of a third-party QuickTime component, please follow the link below to the third-party developer’s web site to see if it is available for download. These third-party components expand the functionality of QuickTime, allowing QuickTime to play additional media types. With QuickTime’s open architecture, third-party developers can create components, or plug-ins to QuickTime.
Welcome to the QuickTime third-party component page.