how can i slower the rate of my animation

[MGCǂSpectre]

... without having it in milkshape/gmax. Because I made the rest animations and are fine but my Walk animation is ridiculously fast and I don't wanna start over all the animations just for that. Is there a tool that can make it slower like auto-expanding it to more frames, etc ? You know importing from .mdx to ms3d or other prog destroys the animations made (and I might mess the rest if I changed them from these programs again).