Address Bar and error message

We are in the process of upgrading our users to 8.5.1 FP2. One of the things that our users like to access is the client address bar. They like to use it to access shared drives on our network. Typically they will just type I: to access a drive mapped for company info. This worked fine in the 6.5.x versions they were using, but now in 8.5.1 they get an error message saying “The system cannot find the device specified” Then the explorer window does open up with the correct drive letter/files… The same happens in my clean install of the client too.

What can we do to eliminate this error?

Anyone have any ideas?