How to get back Win10 lost functionality from WinXP when opening 16 files at once?

How do we get back the Win10 lost functionality from WinXP when opening 16
files at once?

I just want to be able to select any number of *.ovpn files freely
available on the net to then right click and select "Open" so that they are
sent to the OpenVPN Daemon who will process them in a running-log window.

This use model worked fine on Windows XP but it no longer works on Win 10.

However, on Windows 10, you can only "Open" 15 contiguous files at a time:
https://s23.postimg.org/686mmlw17/open_dialog_15.gif

The moment you select 16 contiguous files, you lose the "Open" command:
https://s7.postimg.org/wtx6lvnd7/open_dialog_16.gif

The same Win10 anomoly occurs with disjoint files at the 15-to-16 junction:
https://s8.postimg.org/3uxyragn9/ope...5_disjoint.gif

All I'm asking is how to get Windows 10 to open 16 or more files at once:
https://s22.postimg.org/725sfq64h/op...6_disjoint.gif

--
NOTE: The use model works fine on Windows XP because only 1 file will be
successful, as any that are not successful will just hang in their
respective window and any that are successful after the first successful
connection will automatically close their running-log window. (Since the
running-log window is set to open in the same spot, I just position the
cursor on the [x] and close the stale running logs without moving the
mouse.)