Attached Link: http://www.fignations.com/jelisa/tutorials/p5link.html

Ok, I don't know about adding the P4 texture library to the P5 texture room, but.... I'm assuming that your P4 textues have been converted to mat pose files with some utility or another, such as matposeeit. That so, are you linking your P5 library to the P4 runtime? Here's a tut on it.