Attached Link: http://www.after-effects-clan.com/tut/couche3d/

Little info: rla (old) or rpf (new) are same formats. ;-)

French tutorial:
http://www.after-effects-clan.com/tut/couche3d/
If you do not know french, may be the capture will help you anyway.
Or try a translator like http://dictionary.reference.com/translate/text.html
Good Luck