I would use a .pdf with the necessary link to it. You could add a short instructions text box for those that are computer challenged and even include a link to a reader such as Foxit or Adobe. Most modern browsers will guide the user once a link is clicked, so the user can choose to download the form or open the form if the browser is not configured to open it within the browser. I personally don't want a button that automatically prints a .pdf or any other document until I have seen it as some files have blank pages or unneeded pages and I can choose which page(s) to print. Just my way of working with forms but it does work and Xara / Magix makes it easy to add the link - no coding necessary.
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