Everywhere you find the icon (Open file) , you will be able to access to this file.
Here are two examples:
"Candidate" window
1.Under the tab "Relation", select the name of the relation that you want to view.
2.Click the icon (Open file), the selected file will be displayed.
"Replacement" window
1.You must be positioned in the field "Candidate".
2.Click the icon (Open file) , the selected file will be displayed.