/usr/share/applications/calibre-lrfviewer.desktop is in calibre 3.21.0+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Type=Application
Name=LRF Viewer
GenericName=Viewer for LRF files
Comment=Viewer for LRF files (SONY ebook format files)
TryExec=lrfviewer
Exec=lrfviewer %f
Icon=calibre-viewer
MimeType=application/x-sony-bbeb;
Categories=Graphics;Viewer;
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