/usr/share/applications/fv.desktop is in ftools-fv 5.4+dfsg-1build1.
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]
Version=1.0
Name=fv FITS Editor
GenericName=FITS Editor
Comment=View and manipulate FITS-format files
Type=Application
Exec=fv %F
Icon=fv
MimeType=image/x-fits;
Categories=Education;Science;Astronomy;
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