How to change which sub-item/file is opened when it click on a mother item?

edited September 22, 2017
I have add many files (.mp3, .pdf...) via "add attachment/attach link to file" to an item. When I double click on this item, I would like a specific sub-item to be opened.

How can I modify what sub-item will be opened when I double click on the mother item?

Also, what is the rule that zotero follows to "decide" which sub items is opened?
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