I did that too..Got 3D Max 8 and put the files in hte plugin folder...3D Max reports an error when loading those plugins?
B.t.w. - the fighter was there to show orientation and scale - it doesn't need converting
EDIT:
Hmm..which plugin folder? stdplugs? plugin?
EDI2:
The Prometheus is scaled prett ymuhc OK. But all hte normals are inverted .Lol.