If you look at the back of the piece with that door, on one of the sides of the door you'll see a small metal clip, or hinge. You have to take that out in order to slide the door out. Just use a screwdriver and pop one side of the clip out, then wiggle it to pull it out the rest of the way. Hope that makes sense.
pop and wiggle.. i get it perfectly!
just like kick @ it and swear!