I just tested this in IE and it works.
This was my formula
"\\\\tor2\\public$\\mark shnier\\" & [File name]
To get the correct file path, I opened a Word document, typed a word and then highlighted and right clicked to insert a hyperlink and browsed to my file on our company's P drive.
Then I right clicked on that hyperlink to get the correct file path (copy hyperlink) and pasted it into IE to check it. It worked. Then I mimicked that hyperlink format in the QB formula, each time putting an extra \ character for each \ that was actually required.
I also tested it in Firefox and as expected it did not do anything.
