Missing Samples

Recently after having to change hard drives & logic boards it seems some files have gotten away from the songs they were associated with. I load songs up and I get the message that states that there is a missing file such as Urban 01-103.rex. I scan the MAC I am using & find no such file as this… Then I look for it in the window that comes up I still cannot find it WHEN I know for a fact I AM LOOKING in the right PLACE!

anyone know what Urban 01-103 file is part of