/usr/share/applications/plotdrop.desktop is in plotdrop 0.5.2-3ubuntu1.
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 | [Desktop Entry]
Name=PlotDrop
Comment=Drag and Drop graph plotting
Exec=plotdrop %F
TryExec=plotdrop
Icon=plotdrop.png
Terminal=false
Type=Application
Categories=GNOME;Application;Graphics;
StartupNotify=true
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