Thanks in advance.
I haven't tried this but I think it would work.
You would want to use an anchor link. I "think" this can be done by creating your link, choosing "Open a web page" then pasting in the path to the folder.
You would add file:/// in front of the path. The path must be mapped and available to the users in order to function.
Link Tool > Custom Link > Next > Actions > Open a Web Link > Add > type path, etc.
There was a good tip on another post a while back about how to achieve this. Luckily, I saved it in my archives:
Yes, using a .doc to create a hyper link to a folder then exporting to a pdf then copying the link box to your other pdf works. But if you have rollover effects set up in InDesign this created a button on top of your rollover which is not what I want. I found a way around this longer process...
In InDesign, Create a "button", Add the action "Open file" under the buttons window, Paste your local path in the "select file" area such as this "\\homer\depts\Documentation\Released\!NYSTROM SALES\Stair Treads & Nosings", now save your document and export as interactive and you should be good to go.
I realize this is quite old but I did find a workaround for this that hopefully will help others that come across this post. What I did to combat this is change the text to a file location such as C:/Photos/me instead of text and created a hyperlink off of that. Once the link was working the way I wanted I inserted the text that I wanted it to read as in the middle of this hyperlink so it looked like this, "C:/Photos/mheree". I tested one more time that it had still the original file location and I removed the file path only leaveing the text I had added so the hyperlink just appeared as "here". Hope this helps someone else!