The tib04 door lines up splendidly now. Very nice. Thank you!
The other three doors... well they have a gap along the lower right. Not quite at the same position, I guess. They look good though.
I knew I should have made all together! No problem, I'll make sure they match the settings I have for tib04.
Here's the modified Underwell door texture file: rev_tid_door.dds . Hope that's what you wanted.
I don't think it's something with XnView, as even Max and NWN2 can't read it either. No bother, I'll get another software, this time with alpha channel handling!
The domed door is black and I couldn't trigger it.
For the color, I suspect the blueprint tints it black (0,0,0) instead of white (255,255,255). Unfortunately the dome will still appear black when the door opens. I'm working on a workaround, with a placeable dome on top of a flat door (it works nice, I tried!)
The only way I wasn't able to trigger the dome was when I used it as a placeable and not a door (under the placeable appearance, the dome can be activated with the mouse about one radius away to the right if you didn't change the orientation - of course I've fixed this in the next version).
Edit: some screenshots below of the dome in action.
Closed:

Opening:

Revealing the treasure hidden inside:


In the image below, it looks as if there were two floors:

That's for demo purposes: the highlighted one belongs to the dome itself, whereas the other one is a flat door (let's say it's a drow teleporter!), so that the placeable can be used as a door, as in NWN.