/etc/xdg/autostart/solaar.desktop is in solaar 0.9.2+dfsg-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 11 | [Desktop Entry]
Name=Solaar
Comment=Logitech Unifying Receiver peripherals manager
Exec=solaar
Icon=solaar
StartupNotify=true
Terminal=false
Type=Application
Keywords=logitech;unifying;receiver;mouse;keyboard;
Categories=Utility;GTK;
#Categories=Utility;GTK;Settings;HardwareSettings;
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