/usr/share/applications/lrfviewer.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 | [Desktop Entry]
Type=Application
Name=LRF Viewer
Comment=Viewer for LRF files (SONY ebook format files)
TryExec=lrfviewer
Exec=lrfviewer %F
Icon=calibre
MimeType=application/x-sony-bbeb;
Categories=Graphics;Viewer;
|