The tmp files to delete do not delete automatically and are "marked" so they will not be cleaned using most tools -- they have to be manually snagged. They usually reside in one of the folders in the Poser file itself, typically imageIOplugins or prefs. Shadow.tmp is only part of the file name, as well, and tmp is not the end extension (though I may be wrong there), but they can be found searching on that term

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)