Way to force .pdf to open in Reader and not in browser

I saw where there was an Acrobat action called

Convert PDF2FDF auto-save Action on the AcrobatUsers.com Action Exchange.

which didn't work, it came in corrupted and unusable.  Does anyone know of an action or anything that will force a .pdf hosted online to open in the visitor's Reader program and NOT the browser they are in...?  No matter what browser.

Any help you can give me with this is appreciated.   Looking for a consistent user experience here where they can fill in the information on the pdf form, save it and email it without too much hoopla.

I am really surprised after all of the work I've put into this that this is not something that is more easily accomplished, but perhaps I am doing something wrong or don't have enough information.

Thanks!

Ruth