Haven't used 6.5 for a year or so but seem to remember that in the project setup you selelct Video for Windows NOT PAL DV or NTSC DV. With a new Video for Windows project opened you can set your FPS export rate at what you like e.g 60Fps.
Just bear in mind that when you import your existing footage you must sync the action time to the timeline playback prior to export or the animation, although playing back at 60Fps, will be too fast or too slow.