Fill Adobe Reader Fields from Excel VBA

I can fill fields in a PDF using Excel VBA when I have Acrobat Pro installed however how can I fill the fields from Excel VBA if I only have Adobe Reader installed as I can't reference Acrobat Library in VBA.

I need to do this however we only have limited Acrobat Pro's installed and I can't get it to work for users that only have Adobe Reader.

I would have though there would be an answer to this however I have been search the net for days.

Thanks

Geoff