replied on March 21, 2017
Which version of Web Access do you have installed, and do you have the Office Online server installed and connected to it? The URL you provided is a direct link to the document viewer which will allow you to see any LF image pages generated for the document, the associated thumbnails, annotations, among other things.
From the folder browser, clicking the Word document will follow the option to either try and download the Word file or open its pages in the document viewer. For your user, the option is set to try and download which then throws the Edit/View dialog (download using Office plugin for editing/download in a read-only view mode). If the option was set to "Open electronic files in the Laserfiche document viewer", clicking the document in the folder browser would take you to the same place as your link.
What is your intent with this iframe? With the answers to the questions above and your goal, I may be able to give you some better information.