UPDATE: Here's Trent's included Readme message:

Hello all-
For quite some time I've been interested in the idea of allowing you the ability to tinker around with my tracks - to create remixes, experiment, embellish or destroy what's there. I tried a few years ago to do this in shockwave with very limited results.
After spending some quality time sitting in hotel rooms on a press tour, it dawned on me that the technology now exists and is already in the hands of some of you. I got to work experimenting and came up with something I think you'll enjoy.
What I'm giving you in this file is the actual multi-track audio session for "the hand that feeds" in GarageBand format. This is the entire thing bounced over from the actual Pro Tools session we recorded it into. I imported and converted the tracks into AppleLoop format so the size would be reasonable and the tempo flexible.
So...
You need a Macintosh and you need GarageBand 2.0. If you have a newer Mac, you already have the software. The more RAM you have the better. I did this on a PowerBook 1.67 w/ 2G RAM but it has been running on far less powerful systems.
Drag the file over to your hard disk and double click it. Hit the space bar. Listen.
Change the tempo. Add new loops. Chop up the vocals. Turn me into a woman. Replay the guitar. Anything you'd like.
I gave this to my crew and band to test out and all work effectively stopped for a while - it's fun to mess around with. I've now heard a country version of the track as well as an abstract Latin interpretation (thanks, Leo).
There are some copyright issues involved, so read the notice that pops up. Giving this away is an experiment. I'm interested to see what comes of it, what issues are raised and what the results are.
Have fun-
Trent Reznor
April 15, 2005

Sweet. (And the EULA notice in question mostly just says "Do what you like with this, just don't try to make any money off it.")