mediawiki links to documents

[Roger Searle]

Hi, I have a mediawiki installation working really well.  I had the idea 
to have links to one or 2 documents that reside on some machine on the 
local network, that could be accessed from a wiki page. For example 
(real example) someone looking at a wiki article on the payroll software 
could open a document about annual leave that sits in the folder on the 
computer where the payroll software is installed. 

This is not quite the same as a link to a website or to another wiki 
article and I don't see it mentioned in the documentation I have viewed 
- anyone know if or how this can be done, and offer the syntax?

Cheers,
Roger