/usr/share/applications/lyx.desktop is in lyx 2.1.2-2.
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 | [Desktop Entry]
Version=1.0
Type=Application
Name=LyX
GenericName=Document Processor
Comment=High level LaTeX frontend
Exec=lyx %F
TryExec=lyx
Icon=lyx
StartupNotify=false
StartupWMClass=Lyx
Terminal=false
Categories=Office;WordProcessor;Qt;
MimeType=text/x-lyx;application/x-lyx;
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