MikuMikuDance software allows export to AVI format, but it is not clear whenever this is actually possible from .vpd (pose files) and such vpd to avi conversion might actually not be possible.
Another type of vpd files from PhotoDVD represents projects which contain DVD slideshows and some users are looking for options to export these files to AVI. This supposedly is doable with some video converters, but we couldn't verify this information.