I have Mathematica 11.3.0 and Wolfram CDF Player App 11.3.0 installed on my MacBook Pro running Mojave. When I create CDF files for my students I like to open them in the player app to better see what my students will see when they open them. But for some time now whenever I open a CDF file it always opens in Mathematica even if I change the file's default app in Finder's Get Info window. And CDF files do not show the CDF icon like they used to. How can I fix this?