--- scripts/xdg-utils-common.in.orig	2024-02-06 01:55:07 UTC
+++ scripts/xdg-utils-common.in
@@ -305,6 +305,9 @@ detectDE()
          LXQt)
            DE=lxqt;
            ;;
+         Lumina)
+           DE=lumina
+           ;;
          MATE)
            DE=mate;
            ;;
@@ -317,6 +320,44 @@ detectDE()
       esac
     fi
 
+# xxx PCDM_SESSION check here?
+    if [ -n "${PCDM_SESSION}" ]; then
+      case "${PCDM_SESSION}" in
+         # only recently added to menu-spec, pre-spec X- still in use
+         CINNAMON)
+           DE=cinnamon;
+           ;;
+         ENLIGHTENMENT)
+           DE=enlightenment;
+           ;;
+         # GNOME, GNOME-Classic:GNOME, or GNOME-Flashback:GNOME
+         GNOME*)
+           DE=gnome;
+           ;;
+         KDE)
+           DE=kde;
+           ;;
+         LUMINA)
+           DE=lumina
+           ;;
+         LXDE)
+           DE=lxde;
+           ;;
+         LXQT)
+           DE=lxqt;
+           ;;
+         MATE)
+           DE=mate;
+           ;;
+         XFCE)
+           DE=xfce
+           ;;
+         X-Generic)
+           DE=generic
+           ;;
+      esac
+    fi
+
     # shellcheck disable=SC2153
     if [ -z "$DE" ]; then
       # classic fallbacks
@@ -327,6 +368,8 @@ detectDE()
       elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
       elif xprop -root 2> /dev/null | grep -i '^xfce_desktop_window' >/dev/null 2>&1; then DE=xfce
       elif echo "$DESKTOP" | grep -q '^Enlightenment'; then DE=enlightenment;
+      #Simple fallback for non-XDG window managers if Lumina is installed in the normal place (no heavy runtime dependencies)
+      elif [ -x "%%LOCALBASE%%/bin/lumina-open" ]; then DE=lumina;
       elif [ -n "$LXQT_SESSION_CONFIG" ]; then DE=lxqt;
       fi
     fi