If this is present <string> must be the name of an executable extracted from the CD. After extraction the user is asked if the executable should be run.
execute_with_prompt=subdir1\my.exe
would cause a popup to appear asking the user if <full_target_dir>\subdir1\my.exe should be run (where <full_target_dir> if the Target from the main window).
Note: execute_with_prompt and execute_without_prompt are mutually exclusive.