/usr/share/app-install/desktop/sylpheed:sylpheed.desktop is in app-install-data 0.12.04.4.
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 15 | [Desktop Entry]
X-AppInstall-Package=sylpheed
X-AppInstall-Popcon=665
X-AppInstall-Section=universe
Name=Sylpheed
Comment=E-Mail client
Exec=sylpheed %u
Icon=sylpheed
Terminal=false
Type=Application
Categories=GTK;Network;Email;News;
MimeType=x-scheme-handler/mailto;
X-Ubuntu-Gettext-Domain=app-install-data
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