If this is present <string> must be the name of an executable extracted from the CD. After extraction the executable should automatically launched e.g.
execute_without_prompt=subdir1\my.exe
would automatically run <full_target_dir>\subdir1\my.exe (where <full_target_dir> if the Target from the main window) after CD extraction.
Note: execute_without_prompt and execute_with_prompt are mutually exclusive.