See this old thead for more hints:
https://www.mobileread.com/forums/showthread.php?t=84767
Also I found this, might be helpful:
https://wiki.archlinux.org/index.php/LXDE
Quote:
If not using a display manager you would like to add
export DESKTOP_SESSION=LXDE
to your ~/.bash_profile in order xdg-open to function properly.
...
The application menu works by resolving the .desktop files located in /usr/share/applications. Many desktop environments run programs that supersede these settings to allow customization of the menu. LXDE has yet to create an application menu editor but you can manually build them yourself if you are so inclined. Third party menu editor can be found in AUR - lxmed
To add or edit a menu item, create or link to the .desktop file in /usr/share/applications. Consult the desktop entry specification on freedesktop.org for structures of .desktop files.
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