This is a "fixed" exe to be able to play Thief: Deadly Shadows without the dumb CD in the drive (I HATE having to use game CDs).  Simply go to your Thief3/System folder and rename your original t3.exe to something like "t3_ORIG.exe".  Then copy this new t3.exe to that folder to take its place.  Enjoy!

PS - If you try to use this file to play a pirated copy of Thief 3 I will hunt you down and steal everything you own!  Seriously though, don't steal this game, buy it and support the series.