Hi Paul, use explorer shell like it was intended or commonly known as windows explorer as it is in a temporary location there is a good chance that your computer wouldnt go looking for a torrent file in temporary location by looking at the url supplied. manualy browse for this file and run from inside the shell enviroment check your config and tell your computer to use the program of your choice in the right enviroment the url should work or plan B Have you ran any maintenance software
that could have deleted part of the torrent and does the torrent still exist. give us a visit good luck