Grayface, the problem now is getting the msg/msk and adding code in ZEOBJTS.txt. Care to look at that error?
I got a lot of interesting objects from various games. I am very excited now that I got at least something working.

For the background solution, I choose an object which has dark background. I inserted it in Def tool and choose frames/checked transparency and clicked on the small blue box on its left. Choosed 0.255.255 and clicked ok. Nothing changed, the background is still dark.

Now I solved it in my manner. I opened the bmp in photoshop and used teal airbrush to change the background. It worked.