Opening PDF links locally in Adobe Reader.

Hi,

I have links to pdf files on my slides. I am creating exe files for users. They will use their own laptops to open the exe files.

The pdf links  work fine, but.... I want them to open in Adobe Reader, and when I test on multiple machines they never open in Adobe Reader. Sometimes they open in Explorer, other times Firefox. I think this must be a per machine setting which says "always open pdfs with...." type statement. My question is, does anyone know where this kind of statement is. I really need the pdfs to just open in Adobe Reader to remove a step in the process.

I am aware there is a pdf plugin for web browsers, but don't wan't to use this. I would love to just know how to open the pdf in the actual software.

any help greatly appreciated. have good day all

steve