I also tried an untouched version of debian 12 minimal with updates and only mplayer added from apt. There was no mimeapps.list file in /usr/share/applications, /etc/xdg/, $HOME/.config or $HOME/.local/share/applications. I tried xdg-mime default mplayer.desktop video/x-matroska as the non-root user. Still didn't work. Maybe because there wasn't a mplayer.desktop file in /usr/share/applications like in fedora. I copy over mplayer.desktop without a MimeType field from the original debian 12 miminal media qube and move it to $HOME/.local/share/applications. This gives the same error as the original media qube. I add MimeType=video/x-matroska to the desktop file and re-run the xdg-mime command. I still get the same error.
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