Local Intranet – implementing folder from local server

We are buliding a new intranet for our company and we are stuck with following problem:

We want to have links on different pages / posts to a folder which is located in the local server structure.
It would be ideal to have a userfriendly interface where you can navigate and view through the file structure.
Reason for this is that we want to have our works look up a certain file / form on the intranet (which might be used on different pages / posts. This file should be located in ONE folder on our local server –> once the file needs to be updated, we change this single file and automatically have it updated on all the pages / posts. (We dont want to store all the files in the wordpress content folder)

I hope you can understand what i mean…
we really need your help since we can´t find a solution which suits us!