Batch the Open in New Window option?

New to Lectora as I have inherited a project from someone who left and there was no one else to complete it. It is essentially a very simplistic project with lots of pages. On each page there are buttons that link to various PDFs. My problem is that there are very many buttons in the project. They successfully published to HTML for web placement and it runs fine, but after the fact they now want the PDFs to "Open in a New Window".There are a LOT of buttons that I would have to change properties on and check that Open in New Window option. Isnt there a way to batch change them all? I could also batch affect the PDFs them selves with a third party app to oppen in new window, or within the HTML itself but would MUCH rather find a batch convert the buttons method. Possible?