its highly likely you have downloaded a corrupt file,, or it hasnt been ripped properly, or u have an early stage file of the rip, if its a mogg, then it will open in audacity,, i have hundreds of them, and ive never had a problem, but i did see last year that some guy online couldnt open a mogg, and that was down to it being uncompressed wrong, and was still in stages of being ripped, hope that helps
by all means send me the file, i will try it on my studio pc, as i say, never had any probs with moggs