Theoretically, BVH files will work with every figure; they are supposed to be standard. As usual, the reality is that BVH files can vary quite a bit in how well they work with a particular figure depending upon what motion house and motion software created them. There are multiple implementations of BVH motion capture systems that differ in their final results despite BVH being a "standard". The files will vary in what the call the body groupings, and to what extent they move the groupings. You can do some manual editing on the files (as they are ASCII) but it requires some minimum experience with a text editor. As mentioned, the best way to avoid headaches is to only use "poser-approved" BVH files; there are a couple web sites that sell them (as well as DAZ3D).