/usr/share/applications/calibre-gui.desktop is in calibre 2.5.0+dfsg-1.
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 12 | [Desktop Entry]
Type=Application
Name=calibre
GenericName=E-book library management
GenericName[de]=E-Book Bibliotheksverwaltung
Comment=E-book library management
Comment[es]=aplicación para la gestión de libros electrónicos
Comment[de]=E-Book Bibliotheksverwaltung
Exec=calibre %f
Icon=calibre-gui
Categories=Office;Database;FileTools;Viewer;Qt;
MimeType=x-content/ebook-reader;
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