Usually, if you get the target path of your greenfoot application shortcut (on your desktop, it will continue '/Greenfoot/scenarios'. You should be able to right click on the shortcut and select 'Properties' to find the target path.

That's not what I meant. I know how to find files on my computer. But I want to know if there is a way that the scenario itself can detect where it's saved (even if I move it somewhere else) so it can save stuff in that directory.

You do not have to use complete paths. That is, you can use a local path which starts at the directory your scenario is located. To clarify, for images and sounds in your scenario, you are only putting the name of the file because the method called ('setImage', 'setBackground', and 'playSound') adds the additional folder name to the name given it. For example, when using 'setImage("player1.png")', the 'setImage method uses the path 'images/player1.png'. At any rate, there is really no need to use a complete path. Besides, if you do, you cannot move the scenario without breaking it (you cannot share it in any way or relocate it within your file directory).

Just use the name of the file itself and make sure the file is located in the scenario folder. That way, if you move or copy the scenario, the file moves with it and the local path does not change.

But I don't want the file to be located in the scenario folder. I want the file to be located in the folder where the scenario folder is located.

I believe that you can access the parent folder by using the double dot symbol -- "../filename.txt" (an initial backslash may be needed). However, I remind you again that you must then move both the file and the scenario folder together and that sharing would be out of the question without appropriate changes to the code.

How would I have to change the code so it runs a .jar file too?

I guess you would have to check both local paths (the one with "../" and the one without). Something like this: Of course, you can have: and then have