let
  emacs = [ "emacsclient.desktop" ];
  browser = [ "firefox.desktop" ];
in
{
  "inode/directory" = [ "org.gnome.Nautilus.desktop" ];
  "inode/symlink" = [ "org.gnome.Nautilus.desktop" ];

  "image/jpeg" = [ "com.github.weclaw1.ImageRoll.desktop" ];
  "image/png" = [ "com.github.weclaw1.ImageRoll.desktop" ];
  "audio/mpeg" = [ "com.github.neithern.g4music.desktop" ];
  "video/mp4" = [ "com.github.rafostar.Clapper.desktop" ];

  "text/plain" = emacs;
  "text/richtext" = emacs;
  "text/org" = emacs;
  "text/markdown" = emacs;
  "text/rust" = emacs;
  "text/csv" = emacs;
  "text/css" = emacs;
  "text/tab-separated-values" = emacs;
  "text/html" = browser;

  "text/x-emacs-lisp" = emacs;
  "text/x-fortran" = emacs;
  "text/x-idl" = emacs;
  "text/x-log" = emacs;
  "text/x-lua" = emacs;
  "text/x-makefile" = emacs;
  "text/x-cmake" = emacs;
  "text/x-python" = emacs;
  "text/x-python3" = emacs;
  "text/x-readme" = emacs;
  "text/x-scheme" = emacs;
  "text/x-tex" = emacs;
  "text/x-texinfo" = emacs;

  "application/json" = emacs;
  "application/toml" = emacs;
  "application/yaml" = emacs;
  "application/xml" = emacs;
  "application/rss+xml" = emacs;
  "application/xhtml+xml" = emacs;
  "application/oxps" = emacs;
  "application/zip" = [ "org.gnome.FileRoller.desktop" ];
  "application/pdf" = [ "org.gnome.Evince.desktop" ];
  "application/epub+zip" = [ "org.gnome.Evince.desktop" ];
  "application/msword" = [ "writer.desktop" ];
  "application/x-shellscript" = emacs;
  "application/x-docbook+xml" = emacs;
  "application/x-yaml" = emacs;
  "application/x-archive" = [ "org.gnome.FileRoller.desktop" ];
  "application/x-extension-htm" = browser;
  "application/x-extension-html" = browser;
  "application/x-extension-shtml" = browser;
  "application/x-extension-xhtml" = browser;
  "application/x-extension-xht" = browser;
  "application/x-mozilla-bookmarks" = browser;
  "application/x-zoom" = browser;

  "x-scheme-handler/http" = browser;
  "x-scheme-handler/https" = browser;
  "x-scheme-handler/about" = browser;
  "x-scheme-handler/chrome" = browser;
  "x-scheme-handler/webcal" = browser;
  "x-scheme-handler/geo" = [ "openstreetmap-geo-handler.desktop" ];
  "x-scheme-handler/mailto" = [ "emacsclient-mail.desktop" ];
  "x-scheme-handler/unknown" = emacs;

  "x-scheme-handler/prusaslicer" = [ "PrusaSlicerURLProtocol.desktop" ];

  "x-scheme-handler/ms-word" = [ "writer.desktop" ];
  "x-scheme-handler/ms-powerpoint" = [ "impress.desktop" ];
  "x-scheme-handler/ms-excel" = [ "calc.desktop" ];
  "x-scheme-handler/msteams" = [ "teams-for-linux.desktop" ] ++ browser;
  "x-scheme-handler/zoomus" = browser;
  "x-scheme-handler/zoommtg" = browser;
}