I think it sounds like a good idea to have an option to choose which program opens video/audio files. Sometimes you may want to use a different player. And not necessarily your default video player or audio player. At present, I have 2 default video players for different types of files. VLC for everything except mpeg files which I use QT to play. But that's on a mac & I have mpeg1-4 codecs for QT. But for audio on a mac, it's a little more complex. iTunes can't play all audio types & therefore I use Audion to open some but I can't set it by using defaults or within LW. I'd like to see the choice be within LW.

As ukbobboy01 & Hobo said, it's not such a great idea to add a video player to LW itself.