I only have poser 4, but I guess it's the same in poser 5. This is really (IMHO) a Poser bug, when you save a cr2 Poser saves an abslute path to the map files. Some people have said that Poser will search your Textures folder, it WON'T if an absolute path is used like in the graphic in post #1, in that case it will only look where the path points. Poser WILL search the Textures folder and its sub-folders if you specify a relitive path. Assuming that the "reflection.jpg" is somewhere under Textures in your tree, backup your file then edit the "reflectionMap" line to read:

reflectionMap ":reflection.jpg"