But anyway, thank you. Because of your non-standard way of using it, we know Fpcupdeluxe has such a bug. People use it the proper way like me will never discover that bug
It seems you still did not understand what happened: It deleted the current working directory. In my case it deleted itself, all its ini files and all other files and folders next to it. It had nothing to do with the way I used it.
Have you seen the screencast I linked above? I put it in its own folder and started it, just like you suggested. The outcome was it
deleted itself and all of its ini files! Deleting CWD is the most severe bug you can ever imagine, it has absolutely nothing to do with the way one uses it.
Making a desktop shortcut and clicking on it would have deleted the entire home directory on XFCE and possibly others because the CWD is not set in these desktop starters by default.