How to display a pop up when a user opens a network share

Question

I would like to create a pop-up message whenever a user opens a specific network share (we are migrating to SharePoint Online and many users haven't yet contacted IT in order to coordinate their migration).

I was looking at this old link
https://social.technet.microsoft.com/forums/en-US/ce091ec3-2792-4a91-bd29-3316b90e4fd2/warning-message-popup-message-when-accessing-a-directory
and tried using the steps found there but it did not work for me, even after doing the reghack mentioned in one of links shared in the thread.

I've got the VBS script made like in the link, but the autorun.inf doesn't seem to activate. Any help would greatly be appreciated.