Hi,
Can you be more specific in what you are trying to do? Are you trying to add these to a project? Trying to just add the content of them to a project, or an html widget?
If you are just trying to add them to a project you can add them with the Additional Project files under properties and use a button with the gotoUrl in the on click and point to the files.
Also a sample of what you have already tried or a screenshot would help.