My download finished, and, using a Mac computer, the zip file opened by double clicking, using my default Archive Utility. I was under the impression Windows users tent to use WinZip.
Two files are included. One is mp3, the other cdg ( CD Graphics) which presumably contains the lyrics display.
I hope this helps. One more thing .. Make sure you are not trying to open an incomplete file which may have downloaded alongside a file you intended to download. Some odd bits of files are downloaded as part of the Torrent process, but if incomplete will not work (They are deleted if you cancel a torrent)
Please do not Private Message me with questions that can equally well be posted in the forums, and may also help others. Do use the forum search.