/usr/share/applications/btanks.desktop is in btanks 0.9.8083-4.
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]
Name=Battle Tanks
Comment=fast 2D tank arcade game with multiplayer and split-screen modes
Exec=btanks
Icon=btanks
Terminal=false
Type=Application
Categories=Game;ActionGame;ArcadeGame;
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