Move the file to your trash/recycle bin and empty it.
A real torrent file is very small (a few KB). When you open it in your client, it should show the actual names of the movies, software, or music you expect—not generic names like "xlxlxl..." Download File xlxlxlxlxlxlxlx.torrent
Only download from reputable sites with user comments and "trusted" uploader badges. Move the file to your trash/recycle bin and empty it
If you already downloaded it, do not double-click or run it. do not double-click or run it.