The files in this example are corrupted...

Example: Files like bridge-l.img.b are blackmp behind!

Can you post an example Employee?

The files are fine.  The black is transparent in the game.  Worms uses an indexed palette with the first colour set to black to represent transparency.  All details are in the guide.

Amazing, thx, help a lot!

While working with resources for the terrain, it seemed to me that it would be nice to speed up some operations. Here, at the link, you can download a couple of scripts:
1.__SCRIPT - SHOW OBJECT PROBABILITY VALUES -- A modified script from the topic's current files that displays statistics on how many times objects with a certain probability of occurrence occur
2. +img.bat -- Adds the img suffix to your bmp files so you don't have to rename them manually
3. createINF.bat-- Creates INF files for your images filled with default parameters 5 0 0 1 1 3
4. get_resolutions_final.vbs -- Checks the multiple of your images by 4 and outputs a report in which it also indicates which images do not fit this
All these scripts work from the same folder where your images are located.

https://drive.google.com/file/d/1jF2soG7WQu7YI5YXRvskISIljjjRzE8i/view?usp=sharing