How to remove files that have been added

I'm new to Lectora development and I'm not able to find the answer to these questions in the help files. I'm using Lectora 2008.I created a text hyperlink to an external file. I selected the option to Use Attached File and clicked the Add File button to the right of the drop down list to add a file to the list. Two questions:1. When I publish to HTML, clicking the hyperlink opens the attached file in the same window as the course. How can I make the attached file open in a separate window?2. I have several files in the attached file drop down list including some that I've decided not to use. I tried removing the files from the extern folder but that caused the generation of error messages when publishing. How can I remove files from that drop down list.Please note, this is different from the process for adding files to an external html object. That process uses a list box of files; Add and Remove buttons are available to remove files from the list.Thanks.P.S. If this information IS in the help file, I would appreciate being pointed in the right direction.

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