They won't work with Walk Designer, as is. The WD makes use of short, looping animations we animators call "walk cycles". Ideally, no more than 30 frames, representing a single stride. When the WD generates an animation, it moves a character along the spline path at a calculated rate while repeating the walk cycle as many times as necessary. Walk Designer can blend multiple walk styles into a single cycle, so you can configure it, for instance, to use 60% sexy walk, 30% power walk, 10% sneak if you feel like a little variety. mervpaine's animations are hundreds of frames in length, so they aren't suitable for Walk Designer. If you could trim the animation down to just a single stride from the sequence, manually adjusting the keyframes so that it loops well, and retime it (if necessary) to 30 frames, then it could be added to the pose library's Walk Designer folder and accessed as a blend style from the WD control panel. Other animation elements from mervpaine's sequences, such as the character touching her hair or waving to a crowd, wouldn't be ideal for Walk Designer itself, although you could add them manually at key points after Walk Designer creates the walk animation.