Windows 7 uses its own DirectShow Filters for decoding audio and video formats. You can’t use third Party Filters without making changes to the Registry. Preferred Filter Tweaker for Windows 7 is a freeware tool that lets you use third party filters like ffdshow, CoreAVC, DivX , Cyberlink, etc with just a few mouse clicks. And of course the changes can be always undone. For example, if you