I think that it's only illegal to host or download these files if you don't own the actual game. If you own the game, then I'm pretty sure that you can download these freely as long as you provide a message saying that you must own the game.
Well, if you were to own the game downloading the files would probably be safe. In the case of some of the games (FF7/8, of course, which have PC versions) you get midi's on your CDs. Skillster's probably right: PSF and SPC files are more-or-less dumps from the game: if you own a license to the game data (i.e. you've bought the game) then it's probably legal to own copies of the data; the fact that somebody
else dumped them may not matter ... or then again, it might; copyright laws do vary from country to country.
Hosting files like that is virtually always illegal, disclaimer or no disclaimer. A disclaimer may look good, but what it boils down to is that you're distributing material somebody else has copyrighted, without their permission.
The only way you could get around it would be if you verified that the person owned the game before letting them download it - then you might be able to claim that you were only giving the data to people who were authorised to own it. But because
you're distributing it, it's
your responsibility to check it, you can't just whack a disclaimer on the page. Otherwise hosting warezed games would be legal! "You can only download this game if you already bought a copy..."
Of course, the important thing is that the companies intentionally turn a blind eye towards some things that are technically illegal; midi and graphics certainly fall into this group. Basically, anything that hurts their sales, even only a bit, you're going to be hearing from their lawyers. Distributing midi's doesn't fall into this category
Distributing MP3s does, because they're usually rips from the music CDs they sell.
