/usr/share/applications/lxde-screenlock.desktop is in lxde-common 0.5.5-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Type=Application
Name=ScreenLock
Name[zh_TW]=鎖住螢幕
Name[pt_BR]=Bloquear tela
Comment[pt_BR]=Bloqueie sua tela
Comment=Lock your screen
Icon=system-lock-screen
Exec=lxlock
NoDisplay=true
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