/usr/share/lxpanel/profile/LXDE/config is in lxde-common 0.5.0-4ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Command]
FileManager=pcmanfm %s
Terminal=x-terminal-emulator
Logout=lxde-logout
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