/usr/share/applications/gretl.desktop is in gretl-common 2016a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=gretl
Comment=Econometrics package
Keywords=econometrics;statistics;data;analysis;
Exec=/usr/bin/gretl %f
Icon=gretl
Terminal=false
Type=Application
MimeType=application/gretl.data;application/gretl.session;text/gretl.script
Categories=GTK;Education;Science;Economy;Math;
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