/usr/share/app-install/desktop/claws-mail:claws-mail.desktop is in app-install-data 14.04.0.
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 16 17 18 19 20 | [Desktop Entry]
X-AppInstall-Package=claws-mail
X-AppInstall-Popcon=283
X-AppInstall-Section=universe
Version=1.0
Name=Claws Mail
GenericName=E-mail client
Exec=claws-mail %u
Icon=claws-mail
Categories=Network;Email;
Keywords=lightweight fast x-window extensible plugin pop3 imap nntp
Comment=Lightweight and Fast GTK+ based Mail Client
Terminal=false
Type=Application
StartupNotify=true
MimeType=x-scheme-handler/mailto;
X-Info=Claws Mail
X-Ubuntu-Gettext-Domain=app-install-data
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