Well....
- Run it fullscreen on a 4:3 screen and have black bar on top and bottom.
- Stretch it vertically.
- Cut of a bit on the left and right sides.
Those are your options, none are really pretty... but the first one is ok. But there is no way you can really convert it to fullscreen 4:3 like it was intended to be. You can't add video you don't have

.