Button to open form

I have a form/checklist with instructions on how to complete several other forms. I would like for users to be able to click on a form name and have it open in a new window. I created buttons and used

app.openDoc() with various permutations of the filename and path, but nothing seems to work. Can someone please tell me what specifically needs to be in the parentheses, or if there is a better way to do this.

Thank you.