/usr/share/applications/linthesia.desktop is in linthesia 0.4.2-3.
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 | [Desktop Entry]
Type=Application
Version=0.3
Name=Linthesia
GenericName=Piano game
Icon=linthesia.xpm
Exec=linthesia
Categories=Game;Music;Education
|