The problem explained by an example:
1) I download a movie (say) Y through utorrent.
2) I then start playing the movie Y (with VLC player or GOM player) before it is completely downloaded.
3) Instead of playing Y, it plays some movie Z which I download and DELETED [(*) seemingly] some days ago.
How to delete the "cache" or "remains" of the movie file Z from my hard disk ?
(*) I deleted the "totally" downloaded file, but there is obviously also some cache of it somewhere.