You are referring to the .IMG files in the data folder of worms armageddon?
I remember I read somewhere how to extract the textures and images from those compiled files, and I believe it was in the CL2K (R.I.P).
But together with that I discovered two or three programs and also zipped packages that do that for you, can't remember the name, and if you find it, PLEASE, post it here because I lost all my w:a files when I decided to leave this game some years ago.
From what I remember it was called something like "spriter", worms textures, spritexture or something like that.
Please don't forget me