there is a bug using the action "open URL or File". If I select a PDF from my system and publish the course, everthing is fine and Captivate places the PDF in the output correctly. However when I publish the course again, the file is not included in the dirctory even if no changes have been made to the file.

So if you want to use the "open URL or File" action, you have to select the file again before each publication.