/usr/share/app-install/desktop/calibre:ebook-viewer.desktop is in app-install-data 14.04.0.
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 13 14 15 | [Desktop Entry]
X-AppInstall-Package=calibre
X-AppInstall-Popcon=2244
X-AppInstall-Section=universe
Type=Application
Name=E-Book Viewer
Comment=E-Book Viewer
TryExec=ebook-viewer
Exec=ebook-viewer %F
Icon=calibre
MimeType=application/x-mobipocket-ebook;application/epub+zip;
Categories=Office;Graphics;Viewer;
X-Ubuntu-Gettext-Domain=app-install-data
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