Tie Your Mother Down (Trent Reznor remix)?

That remix is incredibly rare -- I know only of a few people in cyberspace who actually have the file/bootleg CD that contains it.

Try contacting David Fuller; he's likely the one who posted it on YouTube (he goes by DavidRFuller). He has a large bootleg collection, and he's the only one that I can think of who you can reach directly (through his YouTube account of course!). All of the other Queen collectors are a little more hidden on the internet, so it's harder to get a hold of them (and almost all of them are not ones to share their treasures with the rest of us "common Queen fans"). I really don't know how much he would be willing to share the file with you as I've never been in contact with him before, but it would never hurt to ask.

Good luck with your search!