Automatically open .dvdmedia files in DVD Player v.6?

As everyone has probably already noticed, locally stored .dvdmedia files are no longer automatically opened in the new version of DVD Player that comes with Mojave, which is quite a nuisance. Sure, one can change these files into folders and open them from within DVD Player, or keep them as files and have them open in e.g. VLC or Blu-Ray Player (another third party application). But if you'd really like to keep using these files in DVD Player, then surely there must be some clever Terminal command you can type in to "force" DVD Player to automatically open .dvdmedia files?

On another site I found a script for the .plist file that makes them open in VLC, so I tried to apply that script to the DVD Player .plist file, but couldn't get it to work – the file looks fine in Xcode (see screen dump below), showing the new entry "dvdmedia" and all, but I still get an error message in DVD Player when I double-click the .dvdmedia file in Finder ("DVD Player cannot open files of this type").

Can anyone see if there is something wrong with the above script addition (the added lines of text are from "CFBundleTypeExtensisons" to "LSTypeIsPackage") and suggest a correction that will work, or does anyone know of a Terminal command that would make DVD Player open .dvdmedia files automatically (rather than having to open them from within the application), that would be much appreciated! :-)