Strg is the Ctrl key on a German keyboard.
Place the files from the two manual folders directly into your override folder.
Put all the files from folders 2-9+11 into one folder.
Open Xnview.
Scroll through the folder tab until you find the one you put your files in.
Press Ctrl+A.
Right click on any file then click batch processing.
Select TGA under format.
Choose your override folder under directory.
Overwrite should be set to replace.
Click Go.