Watch the homepage of OMARI
http://xoomer.alice.it/glabro1/python241.html
there you can find a sample blender file with a script
it is called "Vertex Colors Example" (on the bottom of this page)
if you generate this .x file you can open it in Unwrap3D and you have
a Model with vertex colors! Makes me very happy!
For test reasons i tried to copy the vertexcolorlist in the .x file to the .x file exported with his normal exporter and there you are a .x file with materials, normals, texturecoords, and Vertexcolor.
I dont understand why this function is not in the normal exporter ?